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ALLOCATE 90The ALLOCATE statement is an extension to FORTRAN 77 but is part of the Fortran 90/95standard. It allocates storage for each pointer-based variable and allocatable array which appearsin the statement. ALLOCATE also declares storage for deferred-shape arrays.SyntaxALLOCATE ( allocation-list [ , STAT= var ] )allocation-list is:allocate-object [ allocate-shape-spec-list ]allocate-object is:variable-namestructure-componentallocate-shape-spec-list is:[ allocate-lower-bound : ] allocate-upper-boundvarnameis an integer variable, integer array element or an integer member of aSTRUCTURE (that is, an integer scalar memory reference). Thisvariable is assigned a value depending on the success of theALLOCATE statement.is a pointer-based variable or name of an allocatable COMMONenclosed in slashes.DescriptionFor a pointer-based variable, its associated pointer variable is defined with the address of theallocated memory area. If the specifier STAT= is present, successful execution of the ALLOCATEstatement causes the status variable to be defined with a value of zero. If an error occurs duringexecution of the statement and the specifier STAT= is present, the status variable is defined tohave the integer value one. If an error occurs and the specifier STAT= is not present, programexecution is terminated.A dynamic, or allocatable COMMON block is a common block whose storage is not allocateduntil an explicit ALLOCATE statement is executed. Note: Allocatable COMMON blocks are anextension to FORTRAN 77 supported only by PGF77 compiler, and not by the PGF95 or PGHPFcompilers.56 Chapter 3
For an ALLOCATABLE array, the array is allocated with the executable ALLOCATE statement.ExamplesCOMMON P, N, MPOINTER (P, A(N,M))COMMON, ALLOCATABLE /ALL/X(10), YALLOCATE (/ALL/, A, STAT=IS)PRINT *, ISX(5) = A(2, 1)DEALLOCATE (A)DEALLOCATE (A, STAT=IS)PRINT *, 'should be 1', ISDEALLOCATE (/ALL/)For a deferred shape array, the allocate must include the bounds of the array.REAL, ALLOCATABLE :: A(:), B(:)ALLOCATE (A(10), B(SIZE(A)))REAL A(:,:)N=3M=1ALLOCATE (A(1:11, M:N))INTEGER FLAG, NREAL, ALLOCATABLE:: B(:,:)ALLOCATE (B(N,N),STAT=FLAG)ARRAYCMFThe ARRAY attribute defines the number of dimensions in an array that may be defined and thenumber of elements and bounds in each dimension.SyntaxARRAY [::] array-name (array-spec)[, array-name (array-spec) ] ...array-namearray-specis the symbolic name of an array.is a valid array specification, either explicit-shape, assumed-shape,deferred-shape, or assumed size (refer to Chapter 4, Fortran Arrays fordetails on array specifications).Fortran Statements 57
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While every precaution has been tak
Page 8 and 9: Table 6-18: HPF Intrinsics and Libr
Page 10 and 11: • ISO/IEC 1539 : 1991, Informatio
Page 12 and 13: non-printing characters, such as TA
Page 14 and 15: 1 Language OverviewThis chapter des
Page 16 and 17: Table 1-1: Order of StatementsOPTIO
Page 18 and 19: 1.3 Free Form FormattingUsing free
Page 20 and 21: A continuation line is indicated by
Page 22 and 23: The following examples are invalid
Page 24 and 25: Operators of equal rank are evaluat
Page 26 and 27: 1.7.3 Relational ExpressionsA relat
Page 28 and 29: 1.9 Assignment StatementsA Fortran
Page 30 and 31: defined in the character expression
Page 33 and 34: 2 Fortran Data TypesEvery Fortran e
Page 35 and 36: Table 2-3: Data Type ExtensionsType
Page 37 and 38: [s]d 1 d 2 ...d n [ _ kind-paramete
Page 39 and 40: 2.2.5 Complex ConstantsA complex co
Page 41 and 42: CHARACTER(LEN=20) FIRST, LAST, MIDD
Page 43 and 44: 2.4.4 Character SubstringA characte
Page 45 and 46: • A constant is always either 32
Page 47 and 48: STRUCTURE [/structure_name/][field_
Page 49 and 50: RECORD /person/ population(2), me..
Page 51 and 52: BYTE items(12)END MAPEND UNIONEND S
Page 53: declarator, modifying its value dur
Page 56 and 57: 90/95 This statement is either new
Page 60 and 61: DescriptionARRAY can be used in a s
Page 62 and 63: ExamplesBACKSPACE 4BACKSPACE ( UNIT
Page 64 and 65: ExamplesCALL CRASH! no argumentsCAL
Page 66 and 67: Note: The data type of a symbol may
Page 68 and 69: HPFExampleDIMENSION R(10)COMMON /HO
Page 70 and 71: ALL1is an allocatable COMMON block
Page 72 and 73: I = I + H..END SUBROUTINE YEND SUBR
Page 74 and 75: DEALLOCATE 77The DEALLOCATE stateme
Page 76 and 77: See AlsoREAD, PRINTDIMENSION 90The
Page 78 and 79: DO (non-block)DO label [,] index =
Page 80 and 81: DOUBLE COMPLEX § 77The DOUBLE COMP
Page 82 and 83: SyntaxIF logical expression THENsta
Page 84 and 85: cfbioserrsis an integer expression
Page 86 and 87: For example:END FILE(20)END FILE(UN
Page 88 and 89: e more than one ENTRY statement wit
Page 90 and 91: EQUIVALENCE 77The EQUIVALENCE state
Page 92 and 93: extrinsic-kind-keyword is the name
Page 94 and 95: if no list items are specified; in
Page 96 and 97: argumentis a symbolic name, startin
Page 98 and 99: ExampleslistASSIGN 50 TO KGO TO K(5
Page 100 and 101: IF (Block) 77The block IF statement
Page 102 and 103: INCLUDE § 77The INCLUDE statement
Page 104 and 105: FILE= finFORM= fmfin is a character
Page 106 and 107: 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
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Return ValueThe return value is the
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SynopsisREAL(A [,KIND])ArgumentsThe
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ArgumentsThe argument X is of type
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Return ValueThe result is an array
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SIZE 90Returns either the total num
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Return ValueThe return value is the
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TRANSFER 90Return a value that has
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VERIFY 90Verify that a character st
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IntrinsicIALL_SUFFIXIANYIANY_PREFIX
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Return ValueThe shifted array with
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getloghostnmlstatputenvsymlnkttynam
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esyndbesj0dbesj1dbesjndbesy0dbesy1d
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Descriptionctime converts a system
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fgetcGet character from a logical u
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Synopsisinteger function fseek(lu,
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Synopsisinteger function getc(ch)ch
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Synopsisinteger function getuid()De
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isattyIs logical unit a tty.Synopsi
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DescriptionReturn the value which i
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perrorPrint error message.Synopsiss
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DescriptionThe functions rand and i
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DescriptionReturn the index of the
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except lstat returns information ab
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ttynamGet name of a terminalSynopsi
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7.2.2 VAX/VMS System SubroutinesDAT
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destis an integer variable or array
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8 OpenMP Directives for FortranThe
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the parallel region redundantly. Th
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In the presence of an IF clause, th
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!$OMP SINGLE [Clauses]< Fortran cod
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By default, there is an implicit ba
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appear within a parallel region. It
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[!$OMP SECTION]< Fortran code block
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directive. When a common block that
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subroutine omp_unset_lock(integer_v
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9 HPF DirectivesHPF directives are
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ALIGN - REALIGNThe ALIGN directive
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See AlsoThe TEMPLATE and PROCESSORS
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Example!HPF$!HPF$!HPF$!HPF$REAL A(1
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See AlsoFor details on the PROCESSO
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TypeSpecificationSee AlsoFor detail
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IntrinsicGLOBAL_TO_LOCALGLOBAL_UBOU
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Return ValueIf the actual argument
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ArgumentsARRAY may be of any type;
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Return TypeThe result is of type de
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ArgumentsOptional argument. PROC.AR
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IndexABSTRACT_TO_PHYSICAL..........
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DATA ..............................
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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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