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psblas3/base/serial/f77/zgelp.f

202 lines
6.2 KiB
FortranFixed

C
C Parallel Sparse BLAS version 2.2
C (C) Copyright 2006/2007/2008
C Salvatore Filippone University of Rome Tor Vergata
C Alfredo Buttari University of Rome Tor Vergata
C
C Redistribution and use in source and binary forms, with or without
C modification, are permitted provided that the following conditions
C are met:
C 1. Redistributions of source code must retain the above copyright
C notice, this list of conditions and the following disclaimer.
C 2. Redistributions in binary form must reproduce the above copyright
C notice, this list of conditions, and the following disclaimer in the
C documentation and/or other materials provided with the distribution.
C 3. The name of the PSBLAS group or the names of its contributors may
C not be used to endorse or promote products derived from this
C software without specific written permission.
C
C THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
C ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
C TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
C PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE PSBLAS GROUP OR ITS CONTRIBUTORS
C BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
C CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
C SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
C INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
C CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
C ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
C POSSIBILITY OF SUCH DAMAGE.
C
C
C SUBROUTINE DGELP(TRANS,M,N,P,B,LDB,WORK,LWORK,IERROR)
C
C Purpose
C =======
C Computing
C B <-- op(P) B
C where op(P) is permutation matrix P or its transpose.
C Notice: when B is a diagonal matrix and it is stored as
C a vector whose entry i is B(i,i), this routine computes
C B <-- P B P(-1)
C where P(-1) is the inverse of P.
C
C Parameters
C ==========
C
C TRANS - CHARACTER*1
C On entry TRANS specifies whetherif the routine operates with
C matrix P or with the transpose of P as follows:
C TRANS = 'N' -> use matrix P
C TRANS = 'T' OR 'C' -> use the transpose of matrix P
C Unchanged on exit.
C
C M - INTEGER
C On entry: number of rows of matrix B.
C Unchanged on exit.
C
C N - INTEGER
C On entry: number of columns of matrix B.
C Unchanged on exit.
C
C P - INTEGER array of dimension (M)
C On entry P specifies the row permutation of matrix B
C (P(1) == 0 if no permutation).
C Unchanged on exit.
C
C B - DOUBLE PRECISION array of dimension (LDB,*)
C On entry: dense matrix.
C On exit: permuted matrix.
C
C LDB - INTEGER
C On entry: leading dimension of B.
C Unchanged on exit.
C
C WORK - DOUBLE PRECISION array of dimension (LWORK)
C On entry: work area.
C On exit INT(WORK(1)) contains the minimum value
C for LWORK satisfying DGELP memory requirements.
C
C LWORK - INTEGER
C On entry LWORK specifies the dimension of WORK
C LWORK should be set as follows:
C LWORK = M
C Unchanged on exit.
C
C IERROR - INTEGER
C On exit IERROR contains the value of error flag as follows:
C IERROR = 0 no error
C IERROR > 0 warning
C IERROR < 0 fatal error
C
C
SUBROUTINE ZGELP(TRANS,M,N,P,B,LDB,WORK,LWORK,IERROR)
IMPLICIT NONE
C .. Scalar Arguments ..
INTEGER LDB, M, N, LWORK, IERROR
CHARACTER TRANS
C .. Array Arguments ..
complex(kind(1.d0)) B(LDB,*), WORK(*)
INTEGER P(*)
C .. Local Scalars ..
INTEGER I, J, ERR_ACT
logical istran,isnotran
C .. Local Arrays..
INTEGER INT_VAL
C .. Intrinsic Functions ..
INTRINSIC DBLE
logical psb_lsame
external psb_lsame
character*20 name
c
C .. Executable Statements ..
C
C
C Check on M, N, LDB, LWORK, TRANS
C
NAME = 'DGELP\0'
IERROR = 0
CALL FCPSB_ERRACTIONSAVE(ERR_ACT)
isnotran = psb_lsame(trans,'N')
istran = psb_lsame(trans,'T') .or. psb_lsame(trans,'C')
IF (M.LT.0) THEN
IERROR = 7
ELSE IF(N.LT.0) THEN
IERROR = 3
ELSE IF(M.GT.LDB) THEN
IERROR = -6
ELSE IF (LWORK.LT.M) THEN
IF (LWORK.EQ.0) THEN
C
C Return minimum LWORK
C
IERROR = 8
WORK(1) = DBLE(M)
GOTO 9998
ELSE IF(LWORK.NE.0) THEN
IERROR = -8
ENDIF
ELSE IF (.not.istran.and..not.isnotran) THEN
IERROR = -1
ENDIF
C
C Error handling
C
IF(IERROR.LT.0) THEN
CALL FCPSB_ERRPUSH(IERROR,NAME,INT_VAL)
GOTO 9999
ENDIF
C
C Check for M, N, P
C
IF(M.LE.0 .OR. N.LE.0 .OR. P(1).EQ.0) THEN
IERROR=5
CALL FCPSB_ERRPUSH(IERROR,NAME,INT_VAL)
GOTO 9999
ENDIF
C
C Switch on TRANS
C
IF (isnotran) THEN
C
C Permuting with P
C
DO 60 J = 1, N
DO 20 I = 1, M
WORK(I) = B(P(I),J)
20 CONTINUE
DO 40 I = 1, M
B(I,J) = WORK(I)
40 CONTINUE
60 CONTINUE
ELSE IF (istran) THEN
C
C Permuting with the transpose of P.
C
DO 160 J = 1, N
DO 120 I = 1, M
WORK(P(I)) = B(I,J)
120 CONTINUE
DO 140 I = 1, M
B(I,J) = WORK(I)
140 CONTINUE
160 CONTINUE
END IF
9998 CONTINUE
CALL FCPSB_ERRACTIONRESTORE(ERR_ACT)
RETURN
9999 CONTINUE
CALL FCPSB_ERRACTIONRESTORE(ERR_ACT)
IF ( ERR_ACT .NE. 0 ) THEN
CALL FCPSB_SERROR()
RETURN
ENDIF
RETURN
END