PGI Fortran Reference manual - The Portland Group

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3F Functions and VAX SubroutinesSynopsissubroutine qsort(array, len, isize, compar)dimension array(*)integer leninteger isizeexternal comparinteger comparDescriptionqsort sorts the elements of the one dimensional array, array. len is the number of elements inthe array and isize is the size of an element. compar is the name of an integer function thatdetermines the sorting order. This function is called with 2 arguments (arg1 and arg2) which areelements of array. The function returns:negativeif arg1 is considered to precede arg2zeroif arg1 is equivalent to arg2positiveif arg1 is considered to follow arg29.1.50. rand, irand, srandRandom number generator.Synopsisdouble precision function rand()integer function irand()subroutine srand(iseed)integer iseedDescriptionThe functions rand and irand generate successive pseudo-random integers or double precisionnumbers. srand uses its argument, iseed, to re-initialize the seed for successive invocations ofrand and irand.irandreturns a positive integer in the range 0 through 2147483647.randreturns a value in the range 0 through 1.0.9.1.51. random, irandm, drandmReturn the next random number value.PGI Fortran Reference Guide 204
3F Functions and VAX SubroutinesSynopsisreal function random(flag)integer flaginteger function irandm(flag)integer flagdouble precision function drandm(flag)integer flagDescriptionIf the argument, flag, is nonzero, the random number generator is restarted before the nextrandom number is generated.Integer values range from 0 through 2147483647.Floating point values range from 0.0 through 1.0.9.1.52. rangeRange functions.Synopsisreal function flmin()real function flmax()real function ffrac()double precision function dflmin()double precision function dflmax()double precision function dffrac()integer function inmax()DescriptionThe following range functions return a value from a range of values.flminminimum single precision valueflmaxmaximum single precision valueffracsmallest positive single precision valuedflminminimum double precision valuedflmaxmaximum double precision valuedffracsmallest positive double precision valueinmaxmaximum integerPGI Fortran Reference Guide 205
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PGI Fortran Reference GuideVersion
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Chapter 2. Fortran Data Types......
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LIST OF TABLESTable 1 Fortran Chara
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PREFACEThis manual describes the Po
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PrefaceInteroperability with C, des
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PrefacePGI Fortran Reference Guide
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Language Overview‣ Fixed source f
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Language OverviewCharacterDescripti
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Language OverviewThe last example i
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Language OverviewTable 5 Arithmetic
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Language OverviewOperator.EQV.Relat
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Chapter 2.FORTRAN DATA TYPESEvery F
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Fortran Data TypesType Meaning Size
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Fortran Data Typessome of these con
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Fortran Data Typesdouble quotes or
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Fortran Data Types‣ The byte size
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Fortran StatementsExampleSUBROUTINE
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Chapter 4.FORTRAN ARRAYSFortran arr
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Fortran Intrinsics6.1.1. Fortran 90
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Object Oriented ProgrammingInherita
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