HP Fortran Programmer's Reference

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HP Fortran statements ALLOCATE ALLOCATE Provides storage space for allocatable arrays and pointer targets. Syntax ALLOCATE (allocation-list[, STAT= scalar-integer-variable]) allocation-list allocation allocate-object allocate-shape-spec-list allocate-shape-spec STAT=scalar-integer-variable 242 is a comma-separated list of allocation. is allocate-object [(allocate-shape-spec-list)]. is variable-name or derived-type-component. Eachallocate-object must be an allocatable array or a pointer. is a comma-separated list of allocate-shape-spec. is [lower-bound:]upper-bound. The bounds in an allocate-shape-spec must be scalar integer expressions. returns the error status after the statement executes. If given, it is set to zero if the statement successfully executed, and to one of the following nonzero values if an error occurred: 1 Error occurred after the array was allocated; for example, an attempt to allocate a previously allocated array. 2 Dynamic memory allocation failure (memory not available) or invalid size (array too large). 3 Errors of both types 1 and 2 have occurred. This kind of an error can only occur if the same ALLOCATE statement is used to allocate more than one array, and both kinds of errors occur. If there is no scalar-integer-variable, the occurrence of an error causes the program to terminate. Chapter 10
Description HP Fortran statements ALLOCATE The ALLOCATE statement creates space for allocatable arrays and targets for variables (scalars or arrays) with the POINTER attribute. The ALLOCATE and DEALLOCATE statements give the user the ability to manage space dynamically at execution time. For allocatable arrays, an error occurs when an attempt is made to allocate an already allocated array or to deallocate an array that is not allocated. The ALLOCATED intrinsic function may be used to determine whether an allocatable array is allocated. A pointer can be associated with a target, either with the pointer assignment statement or by use of the ALLOCATE statement. It is not an error to allocate an already associated pointer; its old target connection is replaced by a connection to the newly allocated space. However, if the previous target was allocated and no other pointer became associated with it, the space is no longer accessible. Examples In the following example, a complex array with the POINTER attribute is declared. Target space is allocated to it at run-time, the amount being determined by two integer values read in. Later in the program, the space is recovered by use of the DEALLOCATE statement. COMPLEX, POINTER :: hermitian (:, :) READ *, m, n ALLOCATE (hermitian (m, n)) DEALLOCATE (hermitian, STAT = ierr) In the next example, a real allocatable array is declared. The amount of space allocated to it depends on how much is available. ! Rank-2 allocatable array REAL, ALLOCATABLE :: intense(:,:) CALL init_i_j(i, j) DO ALLOCATE (intense(i, j), STAT = ierr4) ! ierr4 will be positive if there is not enough space to ! allocate this array IF (ierr4 == 0) EXIT i = i/2; j = j/2 END DO The derived type node in the next example is the basis of a binary tree structure. It consists of a real value component (val) and two pointer components, left and right, bothoftypenode. The variable top (of type node) is declared, and space is allocated for targets for the pointers top%left and top%right. Chapter 10 243
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HP Fortran Programmer’s Reference
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Notice Copyright 1979-2003 Hewlett-
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Contents vi Structurecomponent ....
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Contents viii INTENTattribute......
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Contents x ASSIGN .................
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Contents xii RECORD (extension) ...
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Contents xiv CSHIFT(ARRAY,SHIFT,DIM
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Contents xvi LOC(X)................
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Contents xviii TRANSPOSE(MATRIX)...
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Tables Table9-10.D,E,F,andGeditdesc
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The HP Fortran Programmer’s Refer
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Notational conventions This section
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xxvi Either a or b must be supplied
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NOTE Many of these documents are ac
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Introduction to HP Fortran 2 Data t
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Introduction to HP Fortran HP Fortr
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Introduction to HP Fortran HP Fortr
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Language elements 8 Lexical tokens
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Language elements Lexical tokens Le
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Language elements Program structure
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Language elements Statements Statem
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Language elements Source format of
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Language elements INCLUDE line 22 C
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Data types and data objects 24 Deri
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Data types and data objects Intrins
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Data types and data objects Derived
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Data types and data objects Pointer
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Data types and data objects Pointer
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Arrays 54 Array declarations Array-
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Arrays Array fundamentals a(1,2) a(
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Arrays Array declarations For a giv
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Arrays Array declarations If a proc
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Arrays Array declarations Allocatab
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Arrays Array declarations subscript
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Arrays Array sections Array section
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Arrays Array sections ! The arrays
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Arrays Array-valued structure compo
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Arrays Array-valued structure compo
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Arrays Array constructors depends o
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Arrays Array expressions ! the effe
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Arrays Array-valued functions PROGR
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Arrays Array inquiry intrinsics 80
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Expressions and assignment 82 — O
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Expressions and assignment Expressi
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Expressions and assignment Assignme
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Execution control 104 Control const
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Execution control Control construct
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Execution control Flow control stat
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Program units and procedures 122 Te
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Program units and procedures Termin
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Program units and procedures Main p
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Program units and procedures Main p
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Program units and procedures Extern
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Program units and procedures Intern
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Program units and procedures Statem
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Program units and procedures Argume
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Program units and procedures Proced
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Program units and procedures Module
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Program units and procedures Block
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Program units and procedures Block
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I/O and file handling 170 Files Con
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I/O and file handling Files Files A
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I/O and file handling Connecting a
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I/O and file handling Connecting a
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I/O and file handling File access m
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I/O and file handling Nonadvancing
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I/O and file handling I/O statement
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I/O and file handling Syntax of I/O
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I/O and file handling Syntax of I/O
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Page 262 and 263: HP Fortran statements The following
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HP Fortran statements DO DO Control
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HP Fortran statements DO DO i = 1,
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HP Fortran statements DOUBLE COMPLE
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HP Fortran statements DOUBLE PRECIS
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HP Fortran statements ELSE ELSE Pro
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HP Fortran statements ELSE IF Relat
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HP Fortran statements ENCODE (exten
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HP Fortran statements ENCODE (exten
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HP Fortran statements END Related s
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HP Fortran statements END (structur
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HP Fortran statements END TYPE END
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HP Fortran statements ENDFILE An en
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HP Fortran statements ENTRY 316 The
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HP Fortran statements ENTRY Here ar
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HP Fortran statements EQUIVALENCE T
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HP Fortran statements EQUIVALENCE C
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HP Fortran statements EXTERNAL (sta
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HP Fortran statements EXTERNAL (sta
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HP Fortran statements FORMAT Relate
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HP Fortran statements FUNCTION Desc
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HP Fortran statements GO TO (comput
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HP Fortran statements IF (arithmeti
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HP Fortran statements IF (logical)
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HP Fortran statements IMPLICIT The
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HP Fortran statements INCLUDE Examp
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HP Fortran statements INQUIRE Table
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HP Fortran statements INQUIRE Relat
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HP Fortran statements INTEGER Descr
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HP Fortran statements INTENT (state
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HP Fortran statements INTENT (state
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HP Fortran statements INTERFACE SUB
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HP Fortran statements INTRINSIC (st
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HP Fortran statements LOGICAL Descr
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HP Fortran statements MAP (extensio
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HP Fortran statements MODULE ... FU
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HP Fortran statements MODULE PROCED
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HP Fortran statements NAMELIST The
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HP Fortran statements NULLIFY Relat
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HP Fortran statements ON (extension
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HP Fortran statements OPEN OPEN Con
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HP Fortran statements OPEN FILE=cha
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HP Fortran statements OPEN Table 10
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HP Fortran statements OPTIONAL (sta
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HP Fortran statements OPTIONAL (sta
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HP Fortran statements PARAMETER (st
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HP Fortran statements PARAMETER (st
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HP Fortran statements PAUSE ! Write
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HP Fortran statements POINTER (Cray
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HP Fortran statements POINTER (stat
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HP Fortran statements POINTER (stat
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HP Fortran statements PRINT Formatt
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HP Fortran statements PRIVATE (stat
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HP Fortran statements PROGRAM PROGR
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HP Fortran statements PUBLIC (state
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HP Fortran statements READ READ Inp
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HP Fortran statements READ IOSTAT=i
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HP Fortran statements READ Namelist
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HP Fortran statements REAL Descript
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HP Fortran statements RECORD (exten
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HP Fortran statements RECORD (exten
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HP Fortran statements RETURN RETURN
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HP Fortran statements REWIND REWIND
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HP Fortran statements SAVE (stateme
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HP Fortran statements SAVE (stateme
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HP Fortran statements SEQUENCE SEQU
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HP Fortran statements STATIC (state
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HP Fortran statements STOP STOP Ter
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HP Fortran statements STRUCTURE (ex
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HP Fortran statements SUBROUTINE SU
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HP Fortran statements TARGET (state
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HP Fortran statements TARGET (state
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HP Fortran statements TASK COMMON (
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HP Fortran statements TYPE (declara
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HP Fortran statements TYPE (definit
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HP Fortran statements TYPE (I/O) (e
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HP Fortran statements USE USE Provi
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HP Fortran statements VIRTUAL (exte
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HP Fortran statements WHERE (statem
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HP Fortran statements WHERE (statem
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HP Fortran statements WRITE WRITE O
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HP Fortran statements WRITE Descrip
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HP Fortran statements WRITE 466 Cha
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Intrinsic procedures The following
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Intrinsic procedures Basic terms an
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Intrinsic procedures Nonstandard in
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Intrinsic procedures Data represent
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Intrinsic procedures Functional cat
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Intrinsic procedures Functional cat
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Intrinsic procedures Intrinsic proc
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BLAS and libU77 libraries The libU7
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BLAS and libU77 libraries Calling l
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BLAS and libU77 libraries Calling l
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BLAS and libU77 libraries libU77 ro
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BLAS and libU77 libraries BLAS rout
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BLAS and libU77 libraries BLAS rout
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I/O runtime error messages INTEGER
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I/O runtime error messages Runtime
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Glossary association association Th
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Glossary construct construct Aserie
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Glossary High Performance Fortran (
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Glossary preconnected preconnected
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Glossary type type See data type. t
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Index arrays, 25 derived types, 45
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Index examples, 96 intrinsic, 95 ma
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Index DSYMV, 621 DSYR, 621 DSYR2, 6
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Index hidden length parameter, 146
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Index statement order, 14 continuat
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Index DFLOTI intrinsics function, 5
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Index in expressions, 93 initializa
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Index statement function, 137 when
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Index assigned GO TO, 115, 331 bloc
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Index HSHFT intrinsics function, 53
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Index PRINT, 397 READ, 406 REWIND,
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Index DATE, 504 date and time intri
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Index KNINT, 565 KNOT, 566 KPACK, 5
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Index ISAMAX routine, 620 ISATTY ro
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Index tape input/output routines, 6
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Index derived types, 450 DO loops,
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Index deallocating, 283 declaring,
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Index REAL statement, 411 type decl
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Index filename extensions, 16 fixed
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Index glossary, 643 modules, 317 st
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Index in expressions, 91, 93 triple
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Index Z Zeditdescriptor, 227 ZABS i
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