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61 lines
2.4 KiB
Fortran
61 lines
2.4 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 norm for sparse matrix in CSR Format ...
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DOUBLE PRECISION FUNCTION DCRNRMI(TRANS,M,N,DESCRA,A,IA1,IA2,
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+ INFOA,IERROR)
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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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DOUBLE PRECISION A(*)
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C .. Local scalars ..
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INTEGER I, J
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DOUBLE PRECISION NRMI, SUM
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IERROR=0
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NRMI = 0.0
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DO I = 1, M
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SUM = 0.0
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DO J = IA2(I), IA2(I+1)-1
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SUM = SUM + ABS(A(J))
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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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ENDDO
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DCRNRMI = NRMI
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END
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