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psblas3/base/serial/coo/zcoonrmi.f

69 lines
2.6 KiB
FortranFixed

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 ... Compute Infinity norm for sparse matrix in CSR Format ...
DOUBLE PRECISION FUNCTION ZCOONRMI(TRANS,M,N,DESCRA,A,IA1,IA2,
+ INFOA,IERROR)
IMPLICIT NONE
C .. Scalar Arguments ..
INTEGER M,N, IERROR
CHARACTER TRANS
C .. Array Arguments ..
INTEGER IA1(*),IA2(*),INFOA(*)
CHARACTER DESCRA*11
COMPLEX*16 A(*)
C .. Local scalars ..
INTEGER I, J, K, NNZ
DOUBLE PRECISION NRMI, SUM
NRMI = 0.0
NNZ = INFOA(1)
I = 1
J = I
DO WHILE (I.LE.NNZ)
DO WHILE ((IA1(J).EQ.IA1(I)).AND.
+ (J.LE.NNZ))
J = J+1
ENDDO
SUM = 0.0
DO K = I, J-1
SUM = SUM + ABS(DBLE(A(K))) + ABS(AIMAG(A(K)))
ENDDO
IF (SUM.GT.NRMI) THEN
NRMI = SUM
ENDIF
I = J
ENDDO
ZCOONRMI = NRMI
END