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destis an integer variable or array element that represents the destinationlocation.a5 is an integer expression that identifies the starting position within a4,for the bits being transferred.RANThe RAN subroutine returns the next number from a sequence of pseudo-random numbers ofuniform distribution over the range 0 to 1. The result is a floating point number that is uniformlydistributed in the range between 0.0 and 1.0 exclusive. It has the form:y = RAN(i)where y is set equal to the value associated by the function with the seed argument i. The argumenti must be an INTEGER*4 variable or INTEGER*4 array element.The argument i should initially be set to a large, odd integer value. The RAN function stores avalue in the argument that it later uses to calculate the next random number.There are no restrictions on the seed, although it should be initialized with different values onseparate runs in order to obtain different random numbers. The seed is updated automatically, andRAN uses the following algorithm to update the seed passed as the parameter:SEED = 6969 * SEED + 1 ! MOD 2**32The value of SEED is a 32-bit number whose high-order 24 bits are converted to floating point andreturned as the result.If the command-line option to treat all REAL declarations as DOUBLE PRECISION declarationsis in effect, RAN returns a DOUBLE PRECISION value.SECNDSThe SECNDS subroutine provides system time of day, or elapsed time, as a floating point value inseconds. It has the form:y = SECNDS(x)where (REAL or DOUBLE PRECISION) y is set equal to the time in seconds since midnight,minus the user supplied value of the (REAL or DOUBLE PRECISION) x. Elapsed timecomputations can be performed with the following sequence of calls.284 Chapter 7
X = SECNDS(0.0)...... ! Code to be timed...DELTA = SECNDS(X)The accuracy of this call is the same as the resolution of the system clock.TIMEThe TIME subroutine returns the current system time as an ASCII string. It has the form:CALL TIME(buf)where buf is an eight-byte variable, array, array element, or character substring. The TIME callreturns the time as an eight-byte ASCII character string of the form:hh:mm:ssFor example:16:45:23Note that a 24-hour clock is used.3F Functions and VAX Subroutines 285
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While every precaution has been tak
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Table 6-18: HPF Intrinsics and Libr
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• ISO/IEC 1539 : 1991, Informatio
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non-printing characters, such as TA
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1 Language OverviewThis chapter des
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Table 1-1: Order of StatementsOPTIO
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1.3 Free Form FormattingUsing free
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A continuation line is indicated by
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The following examples are invalid
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Operators of equal rank are evaluat
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1.7.3 Relational ExpressionsA relat
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1.9 Assignment StatementsA Fortran
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defined in the character expression
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2 Fortran Data TypesEvery Fortran e
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Table 2-3: Data Type ExtensionsType
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[s]d 1 d 2 ...d n [ _ kind-paramete
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2.2.5 Complex ConstantsA complex co
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CHARACTER(LEN=20) FIRST, LAST, MIDD
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2.4.4 Character SubstringA characte
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• A constant is always either 32
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STRUCTURE [/structure_name/][field_
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RECORD /person/ population(2), me..
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BYTE items(12)END MAPEND UNIONEND S
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declarator, modifying its value dur
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90/95 This statement is either new
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ALLOCATE 90The ALLOCATE statement i
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DescriptionARRAY can be used in a s
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ExamplesBACKSPACE 4BACKSPACE ( UNIT
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ExamplesCALL CRASH! no argumentsCAL
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Note: The data type of a symbol may
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HPFExampleDIMENSION R(10)COMMON /HO
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ALL1is an allocatable COMMON block
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I = I + H..END SUBROUTINE YEND SUBR
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DEALLOCATE 77The DEALLOCATE stateme
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See AlsoREAD, PRINTDIMENSION 90The
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DO (non-block)DO label [,] index =
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DOUBLE COMPLEX § 77The DOUBLE COMP
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SyntaxIF logical expression THENsta
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cfbioserrsis an integer expression
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For example:END FILE(20)END FILE(UN
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e more than one ENTRY statement wit
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EQUIVALENCE 77The EQUIVALENCE state
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extrinsic-kind-keyword is the name
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if no list items are specified; in
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argumentis a symbolic name, startin
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ExampleslistASSIGN 50 TO KGO TO K(5
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IF (Block) 77The block IF statement
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INCLUDE § 77The INCLUDE statement
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FILE= finFORM= fmfin is a character
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DescriptionWhen an INQUIRE by file
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INTEGER, INTENT(OUT)::I1I1=R1END SU
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SUBROUTINE TRIG (X,F,Y)Y=F(X)RETURN
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Manipulating data using union decla
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Using the -I command-line option di
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ERR=errsFILE= finFORM=fmcharacter d
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ACCESSThe value of 'APPEND' will be
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• Case is not significant, unless
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The pointer-based variable does not
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and is roughly equivalent tocharact
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.END MODULETypeNon-executableSee Al
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• Every item whose value is to be
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DescriptionYou create memory storag
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RETURN 77The RETURN statement cause
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line option). Dummy arguments, name
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STRUCTURE § 77The STRUCTURE statem
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argumentis a symbolic name, startin
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Syntax Derived Type DefinitionTYPE
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BYTE num_itemsBYTE items(12)END MAP
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ExamplesINTEGER SCORE(30)CHARACTER
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eal sumsum = 4h()accept sumand is r
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specified with the ":" character ra
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For example:SUBROUTINE YSUM1(M,B,C)
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4.5 CM Fortran Extensions4.5.1 The
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same manner. Direct access files ar
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Table 5-1: OPEN SpecifiersSpecifier
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After data is transferred, the file
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• Repeatable editor commands whic
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On output, the B field descriptor t
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5.5.2.8 G Format ControlThe G forma
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5.5.2.14 O Format Control Octal Val
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The X control specifies a number of
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5.7 List-directed formattingList-di
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Data TypeINTEGER*4INTEGER*8LOGICAL*
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• The value may be constants as a
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Table 6-1: Numeric FunctionsGeneric
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GenericNameIZEXTPurposeZero-ExtendF
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GenericNameREALPurposeConvert toREA
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GenericNamePurposeNumberof ArgsSIN
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GenericNameIANDPurposeLogicalANDNum
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Table 6-5: Fortran 90/95 Bit Manipu
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Table 6-8: Fortran 90/95 Array Redu
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Table 6-10: Fortran 90/95 Array Con
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Generic Name Purpose Numberof ArgsP
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Table 6-17: Miscellaneous Functions
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ArgumentsThe argument STR is the st
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SynopsisALLOCATED(ARRAY)ArgumentThe
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SynopsisASIND(X)ArgumentThe argumen
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ArgumentThe argument X must be of t
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Return ValueReturns a complex numbe
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COUNT 90Return the number of true e
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VALUES(6)VALUES(7)VALUES(8)holds th
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Return ValueThe dot product. For VE
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EXPONENT 90Return the exponent part
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SynopsisIAND(I, J)ArgumentsThe argu
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ArgumentThe arguments I and J must
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INT8 § 77Converts a real value to
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JINT § 77Converts a value to an in
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LEN 90Returns the length of the sup
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LLT 90Test the supplied strings to
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LSHIFT § 77Perform a logical shift
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If the MASK parameter is present, t
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MINLOC 90Return the position of the
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MVBITS 90Copies a bit sequence from
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SynopsisNULL([PTR])ArgumentsThe opt
Page 236 and 237: Return ValueThe return value is the
Page 238 and 239: SynopsisREAL(A [,KIND])ArgumentsThe
Page 240 and 241: ArgumentsThe argument X is of type
Page 242 and 243: Return ValueThe result is an array
Page 244 and 245: SIZE 90Returns either the total num
Page 246 and 247: Return ValueThe return value is the
Page 248 and 249: TRANSFER 90Return a value that has
Page 250 and 251: VERIFY 90Verify that a character st
Page 252 and 253: IntrinsicIALL_SUFFIXIANYIANY_PREFIX
Page 254 and 255: Return ValueThe shifted array with
Page 256 and 257: getloghostnmlstatputenvsymlnkttynam
Page 258 and 259: esyndbesj0dbesj1dbesjndbesy0dbesy1d
Page 260 and 261: Descriptionctime converts a system
Page 262 and 263: fgetcGet character from a logical u
Page 264 and 265: Synopsisinteger function fseek(lu,
Page 266 and 267: Synopsisinteger function getc(ch)ch
Page 268 and 269: Synopsisinteger function getuid()De
Page 270 and 271: isattyIs logical unit a tty.Synopsi
Page 272 and 273: DescriptionReturn the value which i
Page 274 and 275: perrorPrint error message.Synopsiss
Page 276 and 277: DescriptionThe functions rand and i
Page 278 and 279: DescriptionReturn the index of the
Page 280 and 281: except lstat returns information ab
Page 282 and 283: ttynamGet name of a terminalSynopsi
Page 284 and 285: 7.2.2 VAX/VMS System SubroutinesDAT
Page 289 and 290: 8 OpenMP Directives for FortranThe
Page 291 and 292: the parallel region redundantly. Th
Page 293 and 294: In the presence of an IF clause, th
Page 295 and 296: !$OMP SINGLE [Clauses]< Fortran cod
Page 297 and 298: By default, there is an implicit ba
Page 299 and 300: appear within a parallel region. It
Page 301 and 302: [!$OMP SECTION]< Fortran code block
Page 303 and 304: directive. When a common block that
Page 305 and 306: subroutine omp_unset_lock(integer_v
Page 307 and 308: 9 HPF DirectivesHPF directives are
Page 309 and 310: ALIGN - REALIGNThe ALIGN directive
Page 311 and 312: See AlsoThe TEMPLATE and PROCESSORS
Page 313 and 314: Example!HPF$!HPF$!HPF$!HPF$REAL A(1
Page 315 and 316: See AlsoFor details on the PROCESSO
Page 317: TypeSpecificationSee AlsoFor detail
Page 320 and 321: IntrinsicGLOBAL_TO_LOCALGLOBAL_UBOU
Page 322 and 323: Return ValueIf the actual argument
Page 324 and 325: ArgumentsARRAY may be of any type;
Page 326 and 327: Return TypeThe result is of type de
Page 328 and 329: ArgumentsOptional argument. PROC.AR
Page 331 and 332: IndexABSTRACT_TO_PHYSICAL..........
Page 333 and 334: DATA ..............................
Page 335 and 336: GETLOG ............................
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EXP ...............................
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F specifier........................
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LOCAL_UNIDEX.......................
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OpenMP Fortran Directives .........
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DOWHILE ...........................
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FMT specifier......................
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