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C
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C Parallel Sparse BLAS v2.0
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C (C) Copyright 2006 Salvatore Filippone University of Rome Tor Vergata
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C Alfredo Buttari University of Rome Tor Vergata
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C
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C Redistribution and use in source and binary forms, with or without
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C modification, are permitted provided that the following conditions
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C are met:
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C 1. Redistributions of source code must retain the above copyright
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C notice, this list of conditions and the following disclaimer.
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C 2. Redistributions in binary form must reproduce the above copyright
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C notice, this list of conditions, and the following disclaimer in the
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C documentation and/or other materials provided with the distribution.
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C 3. The name of the PSBLAS group or the names of its contributors may
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C not be used to endorse or promote products derived from this
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C software without specific written permission.
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C
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C THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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C ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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C TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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C PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE PSBLAS GROUP OR ITS CONTRIBUTORS
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C BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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C CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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C SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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C INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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C CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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C ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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C POSSIBILITY OF SUCH DAMAGE.
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C
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C
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C
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C Purpose
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C =======
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C
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C Performing column permutation of a sparse matrix.
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C
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C Parameters
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C ==========
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C
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C TRANS - CHARACTER*1
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C On entry TRANS specifies whether the routine will use
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C matrix P or the transpose of P for the permutation as follows:
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C TRANS = 'N' -> permute with matrix P
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C TRANS = 'T' or 'C' -> permute the transpose of P
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C Unchanged on exit.
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C
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C M - INTEGER
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C On entry: number of rows of matrix A.
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C Unchanged on exit.
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C
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C N - INTEGER
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C On entry: number of columns of matrix A.
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C Unchanged on exit.
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C
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C DESCRA - CHARACTER*5 array of DIMENSION (10)
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C On entry DESCRA defines the format of the input sparse matrix.
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C Unchanged on exit.
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C
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C IA1 - INTEGER array of dimension (*)
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C On entry IA1 holds integer information on input sparse
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C matrix. Actual information will depend on data format used.
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C On exit contain integer information on permuted matrix.
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C
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C IA2 - INTEGER array of dimension (*)
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C On entry IA2 holds integer information on input sparse
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C matrix. Actual information will depend on data format used.
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C On exit contain integer information on permuted matrix.
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C
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C INFOA - INTEGER array of dimension (10)
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C On entry can hold auxiliary information on input matrices
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C formats or environment of subsequent calls.
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C Might be changed on exit.
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C
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C P - INTEGER array of dimension (M)
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C On entry P specifies the column permutation of matrix A
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C (P(1) == 0 if no permutation).
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C Unchanged on exit.
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C
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C WORK - DOUBLE PRECISION array of dimension (LWORK)
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C On entry: work area.
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C On exit INT(WORK(1)) contains the minimum value
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C for LWORK satisfying DSPRP memory requirements.
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C
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C LWORK - INTEGER
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C On entry LWORK specifies the dimension of WORK
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C Unchanged on exit.
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C
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C IERROR - INTEGER
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C On exit IERROR contains the value of error flag as follows:
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C IERROR = 0 no error
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C IERROR > 0 warning
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C IERROR < 0 fatal error
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C WORK - DOUBLE PRECISION array of dimension (LWORK)
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C Work area.
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C
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C LWORK - INTEGER
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C On entry LWORK specifies the dimension of WORK.
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C LWORK must be greater than zero.
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C On exit LWORK is the maximum between the initial value and
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C the minimum value satisfying DSPRP memory requirements.
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C
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C IERROR - INTEGER
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C On exit IERROR contains the value of error flag as follows:
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C IERROR = 0 no error
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C IERROR = 4 error on dimension of vector WORK
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C IERROR = 32 unknown flag TRANS
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C IERROR = 64 LWORK <= 0
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C IERROR = 128 this data structure not yet considered
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C
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C Notes
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C =====
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C It is not possible to call this subroutine with LWORK=0 to get
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C the minimal value for LWORK. This functionality needs a better
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C connection with DxxxMM
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C
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C
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SUBROUTINE DCSRP1(TRANS,M,N,DESCRA,JA,IA,
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+ P,WORK,IWORK,LWORK,IERROR)
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use psb_const_mod
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use psb_spmat_type
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use psb_string_mod
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IMPLICIT NONE
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C .. Scalar Arguments ..
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INTEGER LWORK,M, N, IERROR
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CHARACTER TRANS
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C .. Array Arguments ..
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DOUBLE PRECISION WORK(*)
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INTEGER JA(*), IA(*), P(*), IWORK(*)
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CHARACTER DESCRA*11
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C .. Local Scalars ..
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INTEGER I, J, ERR_ACT
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c .. Local Arrays ..
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CHARACTER*20 NAME
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INTEGER INT_VAL(5)
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C .. Intrinsic Functions ..
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INTRINSIC DBLE
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C
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C .. Executable Statements ..
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C
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NAME = 'DCSRP1\0'
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IERROR = 0
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CALL FCPSB_ERRACTIONSAVE(ERR_ACT)
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IF(toupper(TRANS).EQ.'N') THEN
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DO 30 I=1,M
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DO 10 J=IA(I),IA(I+1)-1
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JA(J) = P(JA(J))
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10 CONTINUE
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30 CONTINUE
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WORK(1) = 0.D0
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ELSE IF(toupper(TRANS).EQ.'T') THEN
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C
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C LWORK refers here to INTEGER IWORK (alias for WORK)
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C
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IF(LWORK.LT.M) THEN
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IERROR = 60
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INT_VAL(1) = 10
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INT_VAL(2) = M
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INT_VAL(3) = LWORK
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CALL FCPSB_ERRPUSH(IERROR,NAME,INT_VAL)
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GOTO 9999
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ENDIF
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C
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C Transpose permutation matrix
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C
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DO 20 I=1,N
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IWORK(P(I)) = I
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20 CONTINUE
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C
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C Permute columns
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C
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DO 50 I=1,M
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DO 40 J=IA(I),IA(I+1)-1
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JA(J) = IWORK(JA(J))
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40 CONTINUE
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50 CONTINUE
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C
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C WORK(1) refers here to a value for a DOUBLE PRECISION WORK
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C
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WORK(1) = DBLE((M+1)/PSB_DBLEINT_)
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ENDIF
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CALL FCPSB_ERRACTIONRESTORE(ERR_ACT)
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RETURN
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9999 CONTINUE
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CALL FCPSB_ERRACTIONRESTORE(ERR_ACT)
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IF ( ERR_ACT .NE. 0 ) THEN
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CALL FCPSB_SERROR()
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RETURN
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ENDIF
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RETURN
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END
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