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205 lines
6.2 KiB
Fortran
205 lines
6.2 KiB
Fortran
C
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C Parallel Sparse BLAS version 2.2
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C (C) Copyright 2006/2007/2008
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C 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 SUBROUTINE DGELP(TRANS,M,N,P,B,LDB,WORK,LWORK,IERROR)
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C
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C Purpose
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C =======
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C Computing
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C B <-- op(P) B
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C where op(P) is permutation matrix P or its transpose.
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C Notice: when B is a diagonal matrix and it is stored as
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C a vector whose entry i is B(i,i), this routine computes
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C B <-- P B P(-1)
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C where P(-1) is the inverse of P.
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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 whetherif the routine operates with
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C matrix P or with the transpose of P as follows:
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C TRANS = 'N' -> use matrix P
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C TRANS = 'T' OR 'C' -> use the transpose of matrix 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 B.
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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 B.
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C Unchanged 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 row permutation of matrix B
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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 B - DOUBLE PRECISION array of dimension (LDB,*)
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C On entry: dense matrix.
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C On exit: permuted matrix.
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C
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C LDB - INTEGER
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C On entry: leading dimension of B.
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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 DGELP 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 LWORK should be set as follows:
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C LWORK = M
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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
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C
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SUBROUTINE DGELP(TRANS,M,N,P,B,LDB,WORK,LWORK,IERROR)
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use psb_const_mod
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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 LDB, M, N, LWORK, IERROR
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CHARACTER TRANS
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C .. Array Arguments ..
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real(psb_dpk_) B(LDB,*), WORK(*)
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INTEGER P(*)
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C .. Local Scalars ..
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INTEGER I, J, ERR_ACT
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logical istran,isnotran
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C .. Local Arrays..
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INTEGER INT_VAL
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C .. Intrinsic Functions ..
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INTRINSIC DBLE
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logical psb_lsame
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external psb_lsame
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character*20 name
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c
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C .. Executable Statements ..
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C
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C
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C Check on M, N, LDB, LWORK, TRANS
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C
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NAME = 'DGELP\0'
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IERROR = 0
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CALL FCPSB_ERRACTIONSAVE(ERR_ACT)
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isnotran = psb_lsame(psb_toupper(trans),'N')
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istran = psb_lsame(psb_toupper(trans),'T') .or.
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+ psb_lsame(psb_toupper(trans),'C')
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IF (M.LT.0) THEN
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IERROR = 7
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ELSE IF(N.LT.0) THEN
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IERROR = 3
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ELSE IF(M.GT.LDB) THEN
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IERROR = -6
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ELSE IF (LWORK.LT.M) THEN
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IF (LWORK.EQ.0) THEN
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C
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C Return minimum LWORK
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C
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IERROR = 8
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WORK(1) = DBLE(M)
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GOTO 9998
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ELSE IF(LWORK.NE.0) THEN
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IERROR = -8
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ENDIF
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ELSE IF (.not.istran.and..not.isnotran) THEN
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IERROR = -1
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ENDIF
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C
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C Error handling
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C
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IF(IERROR.LT.0) THEN
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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 Check for M, N, P
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C
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IF(M.LE.0 .OR. N.LE.0 .OR. P(1).EQ.0) THEN
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IERROR=5
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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 Switch on TRANS
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C
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IF (isnotran) THEN
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C
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C Permuting with P
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C
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DO 60 J = 1, N
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DO 20 I = 1, M
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WORK(I) = B(P(I),J)
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20 CONTINUE
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DO 40 I = 1, M
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B(I,J) = WORK(I)
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40 CONTINUE
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60 CONTINUE
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ELSE IF (istran) THEN
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C
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C Permuting with the transpose of P.
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C
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DO 160 J = 1, N
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DO 120 I = 1, M
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WORK(P(I)) = B(I,J)
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120 CONTINUE
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DO 140 I = 1, M
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B(I,J) = WORK(I)
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140 CONTINUE
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160 CONTINUE
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END IF
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9998 CONTINUE
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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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