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