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psblas3/base/serial/jad/djadsv.f

86 lines
3.0 KiB
Fortran

C
C Parallel Sparse BLAS v2.0
C (C) Copyright 2006 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 This routine compute only the casew with Unit diagonal ...
SUBROUTINE DJADSV(UNITD,NROW,NG,A,KA,IA,JA,X,Y,IERROR)
IMPLICIT REAL*8 (A-H,O-Z)
DIMENSION IA(3,*),JA(*),KA(*),A(*),X(*),Y(*)
CHARACTER UNITD
INTEGER IERROR
IERROR=0
IF (UNITD.EQ.'U') THEN
IF (NG.EQ.0) THEN
DO I = 1, NROW
Y(I) = X(I)
ENDDO
ENDIF
DO IPG=1,NG
DO I = IA(1,IPG),IA(1,IPG+1)-1
Y(I) = X(I)
END DO
*
* LOOP ON COLUMNS
* ---------------
*
IP2 = IA(2,IPG)
DO K = IP2, IA(3,IPG)-1
IPX = IA(1,IPG)
DO I = JA(K), JA(K+1)-1
Y(IPX) = Y(IPX) - A(I)*Y(KA(I))
IPX = IPX+1
ENDDO
ENDDO
*
*
* LOOP ON ROWS
* ---------------
*
IPX = IA(1,IPG)
DO K = IA(3,IPG), IA(2,IPG+1)-1
DO I = JA(K), JA(K+1)-1
Y(IPX) = Y(IPX) - A(I)*Y(KA(I))
ENDDO
IPX = IPX + 1
ENDDO
****************************************
END DO !END LOOP ON IPG=1,NG
****************************************
ELSE
WRITE(0,*) 'ERROR in DJADSV'
ENDIF
RETURN
END