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72 lines
2.6 KiB
Fortran
72 lines
2.6 KiB
Fortran
C
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C Parallel Sparse BLAS version 2.2
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C (C) Copyright 2006/2007/2008
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C 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 norm for sparse matrix in CSR Format ...
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real(psb_dpk_) FUNCTION DCOONRMI(TRANS,M,N,DESCRA,A,IA1,IA2,
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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
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CHARACTER TRANS
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C .. Array Arguments ..
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INTEGER IA1(*),IA2(*),INFOA(*)
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CHARACTER DESCRA*11
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real(psb_dpk_) A(*)
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C .. Local scalars ..
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INTEGER I, J, K, NNZ
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real(psb_dpk_) NRMI, SUM
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IERROR=0
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NRMI = 0.0
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NNZ = INFOA(1)
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I = 1
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J = I
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DO WHILE (I.LE.NNZ)
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DO WHILE ((IA1(J).EQ.IA1(I)).AND.
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+ (J.LE.NNZ))
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J = J+1
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ENDDO
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SUM = 0.0
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DO K = I, J-1
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SUM = SUM + ABS(A(K))
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ENDDO
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IF (SUM.GT.NRMI) THEN
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NRMI = SUM
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ENDIF
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I = J
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ENDDO
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DCOONRMI = NRMI
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END
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