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