You cannot select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
psblas3/base/serial/jad/djadnr.f

90 lines
3.3 KiB
Fortran

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 ... Compute infinity norma for sparse matrix in CSR Format ...
real(psb_dpk_) FUNCTION DJADNR(TRANS,M,N,NG,A,KA,JA,IA,
+ INFOA,IERROR)
use psb_const_mod
use psb_spmat_type
IMPLICIT NONE
C .. Scalar Arguments ..
INTEGER M,N, IERROR, NG
CHARACTER TRANS
C .. Array Arguments ..
INTEGER KA(*),JA(*),IA(3,*),INFOA(*)
real(psb_dpk_) A(*)
C ... Local Array ..
real(psb_dpk_) NRMI_BLOCK(PSB_MAXJDROWS_)
C ... Local Scalars ..
real(psb_dpk_) NRMI
INTEGER I, K, IPG, NPG, IPX
IERROR=0
NRMI = 0.0
DO IPG = 1, NG
K = IA(2,IPG)
NPG = JA(K+1)- JA(K)
C ... Initialize NRMI_BLOCK ...
DO I = 1, NPG
NRMI_BLOCK(I) = 0.0
ENDDO
DO K = IA(2,IPG), IA(3,IPG)-1
IPX = 1
DO I = JA(K), JA(K+1) - 1
NRMI_BLOCK(IPX) = NRMI_BLOCK(IPX) + ABS(A(I))
IPX = IPX + 1
ENDDO
ENDDO
C ... CSR Representation ...
IPX = 1
DO K = IA(3,IPG), IA(2,IPG+1)-1
DO I = JA(K), JA(K+1) - 1
NRMI_BLOCK(IPX) = NRMI_BLOCK(IPX) + ABS(A(I))
ENDDO
IPX = IPX + 1
ENDDO
C ... Compute Max in Block ...
DO I = 1, NPG
IF (NRMI_BLOCK(I).GT.NRMI) THEN
NRMI = NRMI_BLOCK(I)
ENDIF
ENDDO
ENDDO
DJADNR = NRMI
END