0f365f1a5d
* doc/en/command.txt
* doc/en/datetime.txt
* doc/en/dbdelim.txt
* doc/en/dbsdf.txt
* doc/en/dbstrux.txt
* doc/en/dir.txt
* doc/en/diskspac.txt
* doc/en/eval.txt
* doc/en/garbage.txt
* doc/en/gtslang.txt
* doc/en/hashes.txt
* doc/en/hb_api.txt
* doc/en/hb_apier.txt
* doc/en/hb_apigt.txt
* doc/en/hb_apiit.txt
* doc/en/hb_apiln.txt
* doc/en/hb_apird.txt
* doc/en/hb_compa.txt
* doc/en/hb_date.txt
* doc/en/hb_macro.txt
* doc/en/hb_set.txt
* doc/en/hb_vm.txt
* doc/en/idle.txt
* doc/en/input.txt
* doc/en/lang.txt
* doc/en/macro.txt
* doc/en/math.txt
* doc/en/memo.txt
* doc/en/memvar2.txt
* doc/en/misc.txt
* doc/en/string.txt
* doc/en/var.txt
* fixes
* doc/en/*.txt
* set mime-type to UTF-8
744 lines
16 KiB
Plaintext
744 lines
16 KiB
Plaintext
/*
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* $Id$
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*/
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/*
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* The following parts are Copyright of the individual authors.
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* www - http://harbour-project.org
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*
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* Copyright 2000 Luiz Rafael Culik <culik@sl.conex.net>
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* Documentation for: ABS(),EXP(),LOG(),INT(),MAX()
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* MIN(),SQRT(),ROUND()
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* Copyright 2001 IntTec GmbH, Neunlindenstr 32, 79106 Freiburg, Germany
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* Author: Martin Vogel <vogel@inttec.de>
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* Documentation for API
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* $SUBCATEGORY$
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* Math functions
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* See COPYING for licensing terms.
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*
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*/
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/* $DOC$
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* $TEMPLATE$
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* Function
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* $NAME$
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* ABS()
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* $CATEGORY$
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* API
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* $SUBCATEGORY$
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* Math
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* $ONELINER$
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* Return the absolute value of a number.
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* $SYNTAX$
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* ABS(<nNumber>) --> <nAbsNumber>
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* $ARGUMENTS$
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* <nNumber> Any number.
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* $RETURNS$
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* <nAbsNumber> The absolute numeric value.
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* $DESCRIPTION$
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* This function yields the absolute value of the numeric value or
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* expression <nNumber>.
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* $EXAMPLES$
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* PROCEDURE Main()
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* LOCAL nNumber := 50
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* LOCAL nNumber1 := 27
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* CLS
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*
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* ? nNumber - nNumber1
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* ? nNumber1 - nNumber
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* ? ABS( nNumber - nNumber1 )
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* ? ABS( nNumber1 - nNumber )
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* ? ABS( -1 * 345 )
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* $STATUS$
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* R
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* $COMPLIANCE$
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* C
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* $PLATFORMS$
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* All
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* $FILES$
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* Library is rtl
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* $SEEALSO$
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*
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* $END$
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*/
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/* $DOC$
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* $TEMPLATE$
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* Function
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* $NAME$
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* EXP()
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* $CATEGORY$
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* API
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* $SUBCATEGORY$
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* Math
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* $ONELINER$
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* Calculates the value of e raised to the passed power.
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* $SYNTAX$
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* EXP( <nNumber> ) --> <nValue>
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* $ARGUMENTS$
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* <nNumber> Any real number.
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* $RETURNS$
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* <nValue> The anti-logarithm of <nNumber>
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* $DESCRIPTION$
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* This function returns the value of e raised to the power of
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* <nNumber>. It is the inverse of LOG().
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* $EXAMPLES$
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* ? EXP(45)
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* $STATUS$
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* R
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* $COMPLIANCE$
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* C
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* $PLATFORMS$
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* All
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* $FILES$
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* Library is rtl
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* $SEEALSO$
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* LOG()
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* $END$
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*/
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/* $DOC$
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* $TEMPLATE$
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* Function
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* $NAME$
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* INT()
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* $CATEGORY$
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* API
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* $SUBCATEGORY$
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* Math
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* $ONELINER$
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* Return the integer port of a numeric value.
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* $SYNTAX$
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* INT( <nNumber> ) --> <nIntNumber>
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* $ARGUMENTS$
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* <nNumber> Any numeric value.
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* $RETURNS$
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* <nIntNumber> The integer portion of the numeric value.
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* $DESCRIPTION$
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* This function converts a numeric expression to an integer. All
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* decimal digits are truncated. This function does not round a value
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* upward or downward; it merely truncates a number at the decimal
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* point.
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* $EXAMPLES$
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* SET DECIMAL TO 5
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* ? INT( 632512.62541 )
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* ? INT( 845414111.91440 )
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* $STATUS$
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* R
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* $COMPLIANCE$
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* C
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* $PLATFORMS$
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* All
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* $FILES$
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* Library is rtl
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* $SEEALSO$
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* ROUND(),STRZERO()
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* $END$
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*/
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/* $DOC$
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* $TEMPLATE$
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* Function
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* $NAME$
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* LOG()
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* $CATEGORY$
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* API
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* $SUBCATEGORY$
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* Math
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* $ONELINER$
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* Returns the natural logarithm of a number.
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* $SYNTAX$
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* LOG( <nNumber> ) --> <nLog>
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* $ARGUMENTS$
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* <nNumber> Any numeric expression.
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* $RETURNS$
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* <nExponent> The natural logarithm of <nNumber>.
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* $DESCRIPTION$
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* This function returns the natural logarithm of the number <nNumber>.
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* If <nNumber> is 0 or less than 0, a numeric overflow occurs,
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* which is depicted on the display device as a series of asterisks.
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* This function is the inverse of EXP().
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* $EXAMPLES$
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* ? LOG( 632512 )
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* $STATUS$
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* R
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* $COMPLIANCE$
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* C
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* $PLATFORMS$
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* All
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* $FILES$
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* Library is rtl
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* $SEEALSO$
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* EXP()
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* $END$
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*/
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/* $DOC$
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* $TEMPLATE$
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* Function
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* $NAME$
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* MAX()
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* $CATEGORY$
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* API
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* $SUBCATEGORY$
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* Math
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* $ONELINER$
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* Returns the maximum of two numbers or dates.
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* $SYNTAX$
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* MAX( <xValue>, <xValue1> ) --> <xMax>
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* $ARGUMENTS$
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* <xValue> Any date or numeric value.
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*
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* <xValue1> Any date or numeric value (same type as <xValue>).
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* $RETURNS$
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* <xMax> The larger numeric (or later date) value.
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* $DESCRIPTION$
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* This function returns the larger of the two passed espressions. If
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* <xValue> and <xValue1> are numeric data types, the value returned by
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* this function will be a numeric data type as well and will be the
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* larger of the two numbers passed to it. If <xValue> and <xValue1>
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* are date data types, the return value will be a date data type as
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* well. It will be the later of the two dates passed to it.
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* $EXAMPLES$
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* ? MAX( 214514214, 6251242142 )
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* ? MAX( STOD( "20001111" ), STOD( "20140621" ) )
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* $STATUS$
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* R
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* $COMPLIANCE$
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* C
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* $PLATFORMS$
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* All
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* $FILES$
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* Library is rtl
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* $SEEALSO$
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* Min()
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* $END$
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*/
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/* $DOC$
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* $TEMPLATE$
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* Function
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* $NAME$
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* MIN()
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* $CATEGORY$
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* API
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* $SUBCATEGORY$
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* Math
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* $ONELINER$
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* Determines the minumum of two numbers or dates.
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* $SYNTAX$
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* MIN( <xValue>, <xValue1> ) --> <xMin>
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* $ARGUMENTS$
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* <xValue> Any date or numeric value.
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*
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* <xValue1> Any date or numeric value.
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* $RETURNS$
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* <xMin> The smaller numeric (or earlier date) value.
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* $DESCRIPTION$
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* This function returns the smaller of the two passed espressions.
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* <xValue> and <xValue1> must be the same data type. If numeric, the
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* smaller number is returned. If dates, the earlier date is returned.
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* $EXAMPLES$
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* ? MIN( 214514214, 6251242142 )
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* ? MIN( STOD( "20001111" ), STOD( "20140621" ) )
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* $STATUS$
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* R
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* $COMPLIANCE$
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* C
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* $PLATFORMS$
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* All
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* $FILES$
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* Library is rtl
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* $SEEALSO$
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* MAX()
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* $END$
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*/
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/* $DOC$
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* $TEMPLATE$
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* Function
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* $NAME$
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* MOD()
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* $CATEGORY$
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* API
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* $SUBCATEGORY$
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* Math
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* $ONELINER$
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* Return the modulus of two numbers.
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* $SYNTAX$
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* MOD( <nNumber>, <nNumber1> ) --> <nRemainder>
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* $ARGUMENTS$
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* <nNumber> Numerator in a divisional expression.
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*
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* <nNumber1> Denominator in a divisional expression.
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* $RETURNS$
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* <nRemainder> The remainder after the division operation.
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* $DESCRIPTION$
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* This functuion returns the remainder of one number divided by
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* another.
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* $EXAMPLES$
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* ? Mod( 12, 8.521 )
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* ? Mod( 12, 0 )
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* ? Mod( 62412.5142, 4522114.12014 )
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* $STATUS$
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* R
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* $COMPLIANCE$
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* C
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* $PLATFORMS$
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* All
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* $FILES$
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* Library is rtl
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* $SEEALSO$
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* %
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* $END$
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*/
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/* $DOC$
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* $TEMPLATE$
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* Function
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* $NAME$
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* SQRT()
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* $CATEGORY$
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* API
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* $SUBCATEGORY$
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* Math
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* $ONELINER$
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* Calculates the square root of a number.
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* $SYNTAX$
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* SQRT( <nNumber> ) --> <nSqrt>
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* $ARGUMENTS$
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* <nNumber> Any numeric value.
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* $RETURNS$
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* <nSqrt> The square root of <number>.
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* $DESCRIPTION$
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* This function returns the square root of <nNumber>. The precision
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* of this evaluation is based solely on the settings of the
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* SET DECIMAL TO command. Any negative number passed as <nNumber>
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* will always return a 0.
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* $EXAMPLES$
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* SET DECIMAL TO 5
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* ? SQRT( 632512.62541 )
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* ? SQRT( 845414111.91440 )
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* $STATUS$
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* R
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* $COMPLIANCE$
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* C
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* $PLATFORMS$
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* All
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* $FILES$
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* Library is rtl
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* $SEEALSO$
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* ROUND()
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* $END$
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*/
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/* $DOC$
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* $TEMPLATE$
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* Function
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* $NAME$
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* ROUND()
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* $CATEGORY$
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* API
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* $SUBCATEGORY$
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* Math
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* $ONELINER$
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* Rounds off a numeric expression.
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* $SYNTAX$
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* ROUND( <nNumber>,<nPlace> ) --> <nResult>
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* $ARGUMENTS$
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* <nNumber> Any numeric value.
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*
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* <nPlace> The number of places to round to.
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* $RETURNS$
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* <nResult> The rounded number.
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* $DESCRIPTION$
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* This function rounds off the value of <nNumber> to the number of
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* decimal places specified by <nPlace>. If the value of <nPlace> is
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* a negative number, the function will attempt to round <nNumber> in
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* whole numbers. Numbers from 5 through 9 will be rounded up, all
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* others will be rounded down.
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* $EXAMPLES$
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* ? ROUND( 632512.62541, 5 )
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* ? ROUND( 845414111.91440, 3 )
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* $STATUS$
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* R
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* $COMPLIANCE$
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* C
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* $PLATFORMS$
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* All
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* $FILES$
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* Library is rtl
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* $SEEALSO$
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* INT(),STR(),VAL(),SET FIXED
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* $END$
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*/
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/* $DOC$
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* $TEMPLATE$
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* Function
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* $NAME$
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* hb_mathGetLastError()
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* $CATEGORY$
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* C level API
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* $SUBCATEGORY$
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* Math
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* $ONELINER$
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* get the last math lib error
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* $SYNTAX$
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* C Prototype
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*
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* #include "hbmath.h"
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* hb_mathGetLastError( HB_MATH_EXCEPTION * phb_exc )
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* --> int iMathErrorType
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* $ARGUMENTS$
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* phb_exc pointer to HB_MATH_EXCEPTION structure, if not NULL,
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* the structure will be filled with information about the
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* last math error:
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*
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* typedef struct _HB_MATH_EXCEPTION {
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* int type; // Math error type, is one of the constants
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* // HB_MATH_ERR_xxx defined in hbmath.ch
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* char *funcname; // Pointer to name of the math C RTL routine
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* // that caused the error.
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* char *error; // Pointer to error description.
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* double arg1; // First and
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* double arg2; // Second double argument to the math routine.
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* double retval; // Corrected return value for the math routine.
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* int retvalwidth; // Width and
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* int retvaldec; // Decimals of the corrected return value,
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* // both default to -1
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* int handled; // 1, if the math error is already corrected,
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* // 0 otherwise.
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* } HB_MATH_EXCEPTION;
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* $RETURNS$
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* <iMathErrorType>
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* $DESCRIPTION$
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*
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* $EXAMPLES$
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*
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* $STATUS$
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* R
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* $COMPLIANCE$
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* NA
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* $FILES$
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* Header file is hbmath.h
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* Library is rtl
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* $PLATFORMS$
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* All
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* $SEEALSO$
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*
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* $END$
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*/
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/* $DOC$
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* $TEMPLATE$
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* Procedure
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* $NAME$
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* hb_mathResetError()
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* $CATEGORY$
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* C level API
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* $SUBCATEGORY$
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* Math
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* $ONELINER$
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* Reset the internal math error information structure
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* $SYNTAX$
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* C Prototype
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*
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* #include "hbmath.h"
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* hb_mathResetError( void )
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* $ARGUMENTS$
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*
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* $DESCRIPTION$
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*
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* $EXAMPLES$
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*
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* $STATUS$
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* R
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* $COMPLIANCE$
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* NA
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* $FILES$
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* Header file is hbmath.h
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* Library is rtl
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* $PLATFORMS$
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* All
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* $SEEALSO$
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*
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* $END$
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*/
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/* $DOC$
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* $TEMPLATE$
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* Function
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* $NAME$
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* hb_mathIsMathErr()
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* $CATEGORY$
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* C level API
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* $SUBCATEGORY$
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* Math
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* $ONELINER$
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* Check if harbour math error handling is available
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* $SYNTAX$
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* C Prototype
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*
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* #include "hbmath.h"
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* hb_mathIsMathErr( void ) --> int iIsMathHandler
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* $ARGUMENTS$
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*
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* $RETURNS$
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* <iIsMathHandler>
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* $DESCRIPTION$
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*
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* $EXAMPLES$
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*
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* $STATUS$
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* R
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* $COMPLIANCE$
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* NA
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* $FILES$
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* Header file is hbmath.h
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* Library is rtl
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* $PLATFORMS$
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* All
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* $SEEALSO$
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*
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* $END$
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*/
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/* $DOC$
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* $TEMPLATE$
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* Function
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* $NAME$
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* hb_mathSetHandler()
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* $CATEGORY$
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* C level API
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* $SUBCATEGORY$
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* Math
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* $ONELINER$
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* set the harbour math handler
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* $SYNTAX$
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* C Prototype
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*
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* #include "hbmath.h"
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* hb_mathSetHandler( HB_MATH_HANDLERPROC handlerproc )
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* --> HB_MATH_HANDLERPROC previous_handerproc
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* $ARGUMENTS$
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* handlerproc custom math handler
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* typedef int (* HB_MATH_HANDLERPROC)(HB_MATH_EXCEPTION * err)
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* $RETURNS$
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* previous_handlerproc previous math handler
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* typedef int (* HB_MATH_HANDLERPROC)(HB_MATH_EXCEPTION * err)
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* $DESCRIPTION$
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*
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* $EXAMPLES$
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*
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* $STATUS$
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* R
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* $COMPLIANCE$
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* NA
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* $FILES$
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* Header file is hbmath.h
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* Library is rtl
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* $PLATFORMS$
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|
* All
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|
* $SEEALSO$
|
|
*
|
|
* $END$
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|
*/
|
|
|
|
/* $DOC$
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|
* $TEMPLATE$
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|
* Function
|
|
* $NAME$
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|
* hb_mathGetHandler()
|
|
* $CATEGORY$
|
|
* C level API
|
|
* $SUBCATEGORY$
|
|
* Math
|
|
* $ONELINER$
|
|
* get current Harbour math error handler
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|
* $SYNTAX$
|
|
* C Prototype
|
|
*
|
|
* #include "hbmath.h"
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|
* hb_mathGetHandler( void ) --> HB_MATH_HANDLERPROC handlerproc
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|
* $ARGUMENTS$
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|
* handlerproc custom math handler
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|
* typedef int (* HB_MATH_HANDLERPROC)(HB_MATH_EXCEPTION * err)
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|
* $RETURNS$
|
|
* <handerproc>
|
|
* $DESCRIPTION$
|
|
*
|
|
* $EXAMPLES$
|
|
*
|
|
* $STATUS$
|
|
* R
|
|
* $COMPLIANCE$
|
|
* NA
|
|
* $FILES$
|
|
* Header file is hbmath.h
|
|
* Library is rtl
|
|
* $PLATFORMS$
|
|
* All
|
|
* $SEEALSO$
|
|
*
|
|
* $END$
|
|
*/
|
|
|
|
/* $DOC$
|
|
* $TEMPLATE$
|
|
* Function
|
|
* $NAME$
|
|
* hb_mathSetErrMode()
|
|
* $CATEGORY$
|
|
* C level API
|
|
* $SUBCATEGORY$
|
|
* Math
|
|
* $ONELINER$
|
|
* set math error handling mode
|
|
* $SYNTAX$
|
|
* C Prototype
|
|
*
|
|
* #include "hbmath.h"
|
|
* hb_mathSetErrMode( int imode ) --> int ioldmode
|
|
* $ARGUMENTS$
|
|
* imode math error handling mode, one of the following
|
|
* constants, defined in hbmath.ch:
|
|
* HB_MATH_ERRMODE_DEFAULT
|
|
* HB_MATH_ERRMODE_CDEFAULT
|
|
* HB_MATH_ERRMODE_USER
|
|
* HB_MATH_ERRMODE_USERDEFAULT
|
|
* HB_MATH_ERRMODE_USERCDEFAULT
|
|
* $RETURNS$
|
|
* ioldmode old math error handling mode
|
|
* $DESCRIPTION$
|
|
*
|
|
* $EXAMPLES$
|
|
*
|
|
* $STATUS$
|
|
* R
|
|
* $COMPLIANCE$
|
|
* NA
|
|
* $FILES$
|
|
* Header file is hbmath.h
|
|
* Library is rtl
|
|
* $PLATFORMS$
|
|
* All
|
|
* $SEEALSO$
|
|
* hb_mathGetErrMode()
|
|
* $END$
|
|
*/
|
|
|
|
/* $DOC$
|
|
* $TEMPLATE$
|
|
* Function
|
|
* $NAME$
|
|
* hb_mathGetErrMode()
|
|
* $CATEGORY$
|
|
* C level API
|
|
* $SUBCATEGORY$
|
|
* Math
|
|
* $ONELINER$
|
|
* get math error handling mode
|
|
* $SYNTAX$
|
|
* C Prototype
|
|
*
|
|
* #include "hbmath.h"
|
|
* hb_mathGetErrMode( void ) --> imode
|
|
* $ARGUMENTS$
|
|
*
|
|
* $RETURNS$
|
|
* imode math error handling mode
|
|
* $DESCRIPTION$
|
|
*
|
|
* $EXAMPLES$
|
|
*
|
|
* $STATUS$
|
|
* R
|
|
* $COMPLIANCE$
|
|
* NA
|
|
* $FILES$
|
|
* Header file is hbmath.h
|
|
* Library is rtl
|
|
* $PLATFORMS$
|
|
* All
|
|
* $SEEALSO$
|
|
* hb_mathSetErrMode()
|
|
* $END$
|
|
*/
|
|
|
|
/* $DOC$
|
|
* $TEMPLATE$
|
|
* Function
|
|
* $NAME$
|
|
* HB_MATHERMODE()
|
|
* $CATEGORY$
|
|
* API
|
|
* $SUBCATEGORY$
|
|
* Math
|
|
* $ONELINER$
|
|
* Set/Get math error handling mode
|
|
* $SYNTAX$
|
|
* HB_MATHERMODE( [<nNewMode>] ) --> <nOldMode>
|
|
* $ARGUMENTS$
|
|
* [<nNumber>] new math error handling mode, one of the following
|
|
* constants, defined in hbmath.ch:
|
|
* HB_MATH_ERRMODE_DEFAULT
|
|
* HB_MATH_ERRMODE_CDEFAULT
|
|
* HB_MATH_ERRMODE_USER
|
|
* HB_MATH_ERRMODE_USERDEFAULT
|
|
* HB_MATH_ERRMODE_USERCDEFAULT
|
|
* $RETURNS$
|
|
* <nOldMode> old math error handling mode
|
|
* $DESCRIPTION$
|
|
*
|
|
* $EXAMPLES$
|
|
*
|
|
* $STATUS$
|
|
* R
|
|
* $COMPLIANCE$
|
|
*
|
|
* $PLATFORMS$
|
|
* All
|
|
* $FILES$
|
|
* Header file is hbmath.ch
|
|
* Library is rtl
|
|
* $SEEALSO$
|
|
*
|
|
* $END$
|
|
*/
|
|
|
|
/* $DOC$
|
|
* $TEMPLATE$
|
|
* Function
|
|
* $NAME$
|
|
* HB_MATHERBLOCK()
|
|
* $CATEGORY$
|
|
* API
|
|
* $SUBCATEGORY$
|
|
* Math
|
|
* $ONELINER$
|
|
* Set/Get math error handling codeblock
|
|
* $SYNTAX$
|
|
* HB_MATHERBLOCK( [<bNewBlock>] ) --> <bOldBlock>
|
|
* $ARGUMENTS$
|
|
* <bNewBlock>
|
|
* $RETURNS$
|
|
* <bOldBlock> is the current error handler codeblock
|
|
* $DESCRIPTION$
|
|
*
|
|
* $EXAMPLES$
|
|
*
|
|
* $STATUS$
|
|
* R
|
|
* $COMPLIANCE$
|
|
*
|
|
* $PLATFORMS$
|
|
* All
|
|
* $FILES$
|
|
* Library is rtl
|
|
* $SEEALSO$
|
|
*
|
|
* $END$
|
|
*/
|