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