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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 SUBROUTINE DCRCR(TRANS,M,N,UNITD,D,DESCRA,A,IA1,IA2,INFOA,IP1,
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C DESCRN,AN,IAN1,IAN2,INFON,IP2,LAN,LIAN1,LIAN2,
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C WORK,LWORK,IERROR)
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C
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C Purpose: CSR to CSR format conversion
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C =======
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C
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C Parameter:
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C =========
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C
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C TRANS - CHARACTER*1
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C On entry TRANS specifies whether the routine will convert
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C matrix A or the transpose of A as follows:
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C TRANS = 'N' -> convert matrix A
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C TRANS = 'T' or 'C' -> convert A' (the transpose of A)
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C Unchanged on exit.
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C
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C M - INTEGER
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C On entry: number of rows of matrix A (A')
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C and number of rows of matrix H
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C Unchanged on exit.
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C
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C N - INTEGER
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C On entry: number of columns of matrix A (A')
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C and number of columns of matrix H
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C Unchanged on exit.
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C
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C UNITD - CHARACTER*1
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C On entry UNITD specifies whether the diagonal matrix is unit
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C or whether row or column scaling has to be performed, as follows:
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C UNITD = 'U' -> unit matrix (no scaling)
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C UNITD = 'L' -> scale on the left (row scaling)
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C UNITD = 'R' -> scale on the right (column scaling)
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C UNITD = 'B' -> scale on the right and on the left
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C with D^1/2
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C Unchanged on exit.
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C
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C D - DOUBLE PRECISION array of dimension (M)
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C On entry D specifies the main diagonal of the matrix used
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C for scaling.
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C Unchanged on exit.
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C
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C DESCRA - CHARACTER*1 array of DIMENSION (9)
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C On entry DESCRA describes the characteristics of the input
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C sparse matrix.
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C Unchanged on exit.
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C
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C A - DOUBLE PRECISION array of DIMENSION (*)
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C On entry A specifies the values of the input sparse
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C matrix.
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C Unchanged on exit.
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C
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C IA1 - INTEGER array of dimension (*)
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C On entry IA1 holds integer information on input sparse
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C matrix. Actual information will depend on data format used.
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C Unchanged on exit.
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C
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C IA2 - INTEGER array of dimension (*)
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C On entry IA2 holds integer information on input sparse
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C matrix. Actual information will depend on data format used.
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C Unchanged on exit.
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C
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C INFOA - INTEGER array of dimension (10)
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C On entry can hold auxiliary information on input matrices
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C formats or environment of subsequent calls.
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C Might be changed on exit.
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C
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C IP1 - INTEGER array of dimension (M)
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C On exit IP1 specifies the row permutation of matrix AN
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C (IP1(1) == 0 if no permutation).
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C
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C DESCRN - CHARACTER*1 array of DIMENSION (9)
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C On exit DESCRN describes the characteristics of the input
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C sparse matrix.
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C Unchanged on exit.
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C
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C AN - DOUBLE PRECISION array of DIMENSION (LAN)
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C On exit AN specifies the values of the output sparse
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C matrix. If LAN=0, INT(AN(1)) is the minimum value for LAN
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C satisfying DSPDP memory requirements.
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C
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C IAN1 - INTEGER array of dimension (LIAN1)
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C On exit IAN1 holds integer information on output sparse
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C matrix. Actual information will depend on data format used.
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C If LIAN1=0, INT(IAN1(1)) is the minimum value for LIAN1
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C satisfying DSPDP memory requirements.
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C
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C IAN2 - INTEGER array of dimension (LIAN2)
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C On exit IAN2 holds integer information on output sparse
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C matrix. Actual information will depend on data format used.
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C If LIAN2=0, INT(IAN2(1)) is the minimum value for LIAN2
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C satisfying DSPDP memory requirements.
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C
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C INFON - INTEGER array of dimension (10)
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C On exit can hold auxiliary information on output matrices
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C formats or environment of subsequent calls.
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C
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C IP2 - INTEGER array of dimension (M)
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C On exit IP2 specifies the column permutation of matrix AN
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C (IP2(1) == 0 if no permutation).
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C
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C LAN - INTEGER
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C On entry LAN specifies the dimension of AN
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C LAN must satisfy memory required from the new data structure.
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C Unchanged on exit.
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C
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C LIAN1 - INTEGER
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C On entry LH1 specifies the dimension of IAN1
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C LH1 must satisfy memory required from the new data structure.
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C Unchanged on exit.
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C
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C LIAN2 - INTEGER
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C On entry LIAN2 specifies the dimension of IAN2
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C LIAN2 must satisfy memory required from the new data structure.
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C Unchanged on exit.
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C
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C WORK - DOUBLE PRECISION array of dimension (LWORK)
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C On entry: work area.
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C On exit INT(WORK(1)) contains the minimum value
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C for LWORK satisfying DSPDP memory requirements.
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C
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C LWORK - INTEGER
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C On entry LWORK specifies the dimension of WORK
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C LWORK must satisfy memory necessary for the data conversion.
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C Unchanged on exit.
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C
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C IERROR - INTEGER
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C On exit IERROR contains the value of error flag as follows:
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C IERROR = 0 no error
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C IERROR > 0 error
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C
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C
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SUBROUTINE DCRCR(TRANS,M,N,UNITD,D,DESCRA,A,IA1,IA2,INFOA,IP1,
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* DESCRN,AN,IAN1,IAN2,INFON,IP2,LAN,LIAN1,LIAN2,
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* WORK,LWORK,IERROR)
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use psb_string_mod
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IMPLICIT NONE
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C
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C .. Scalar Arguments ..
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INTEGER M, N, LAN, LIAN1, LIAN2, LWORK, IERROR
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CHARACTER TRANS, UNITD
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C .. Array Arguments ..
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DOUBLE PRECISION A(*), AN(*), D(*), WORK(LWORK)
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INTEGER IA1(*), IA2(*), IAN1(*), IAN2(*), IP1(*), IP2(*),
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* INFOA(*), INFON(*)
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CHARACTER DESCRA*11, DESCRN*11
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C .. Local Scalars ..
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INTEGER I, J, ERR_ACT
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LOGICAL EXIT
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c .. Local Arrays ..
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character idescra*11
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CHARACTER*20 NAME
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INTEGER INT_VAL(5)
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C .. Intrinsic Functions ..
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INTRINSIC DBLE, DSQRT
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C .. Executable Statements ..
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C
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EXIT=.FALSE.
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NAME = 'DCRCR'
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IERROR = 0
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CALL FCPSB_ERRACTIONSAVE(ERR_ACT)
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C
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C Check for argument errors
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C
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idescra=toupper(descra)
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IF (((idescra(1:1) .EQ. 'S' .OR. idescra(1:1) .EQ. 'H' .OR.
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& idescra(1:1) .EQ. 'A') .AND. (toupper(unitd) .NE. 'B'))
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+ .OR.
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& (.NOT.((idescra(3:3).EQ.'N').OR.(idescra(3:3).EQ.'L').OR.
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+ (idescra(3:3).EQ.'U')))
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+ .OR.
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+ toupper(TRANS).NE.'N') THEN
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IERROR = 20
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ENDIF
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IF(LAN.LT.(IA2(M+1)-1)) THEN
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IF (LAN.LE.0) THEN
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EXIT=.TRUE.
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AN(1) = DBLE(IA2(M+1)-1)
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ELSE
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IERROR = 21
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ENDIF
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ENDIF
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IF(LIAN1.LT.(IA2(M+1)-1)) THEN
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IF (LAN.LE.0) THEN
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EXIT=.TRUE.
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IAN1(1) = IA2(M+1)-1
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ELSE
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IERROR = 22
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ENDIF
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ENDIF
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IF(LIAN2.LT.(M+1)) THEN
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IF (LAN.LE.0) THEN
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EXIT=.TRUE.
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IAN2(1) = M+1
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ELSE
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IERROR = 23
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ENDIF
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ENDIF
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IF ((idescra(1:1) .EQ. 'S' .OR. idescra(1:1) .EQ. 'H' .OR.
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& idescra(1:1) .EQ. 'A') .AND. (toupper(UNITD) .EQ. 'B')) THEN
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IF (LWORK.LT.M) THEN
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IF (LWORK.LE.0) THEN
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EXIT=.TRUE.
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ELSE
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IERROR = 25
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ENDIF
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WORK(1) = DBLE(M)
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ENDIF
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ELSE
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IF (LWORK.LT.0) THEN
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WORK(1) = 0.D0
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ENDIF
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ENDIF
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C
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C Error handling
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C
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IF(IERROR.NE.0) THEN
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CALL FCPSB_ERRPUSH(IERROR,NAME,INT_VAL)
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GOTO 9999
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END IF
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IF (EXIT) goto 9998
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C
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C Set DESCRN, IP1, IP2
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C
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DESCRN(1:3) = idescra(1:3)
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IP1(1)=0
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IP2(1)=0
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C
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C Compute output matrix
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C
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DO 20 I = 1, M+1
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IAN2(I) = IA2(I)
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20 CONTINUE
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IF ((idescra(1:1) .EQ. 'S' .OR. idescra(1:1) .EQ. 'H' .OR.
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& idescra(1:1) .EQ. 'A') .AND. (toupper(UNITD) .EQ. 'B')) THEN
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DO 30 I = 1, M
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WORK(I) = DSQRT(D(I))
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30 CONTINUE
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DO 40 I = 1, M
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DO 50 J = IA2(I), IA2(I+1)-1
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AN(J) = WORK(I) * A(J) * WORK(IA1(J))
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IAN1(J) = IA1(J)
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50 CONTINUE
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40 CONTINUE
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ELSE IF (toupper(UNITD) .EQ. 'L') THEN
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DO 60 I = 1, M
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DO 70 J = IA2(I), IA2(I+1)-1
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AN(J) = D(I) * A(J)
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IAN1(J) = IA1(J)
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70 CONTINUE
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60 CONTINUE
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ELSE IF (toupper(UNITD) .EQ. 'R') THEN
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DO 80 I = 1, M
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DO 90 J = IA2(I), IA2(I+1)-1
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AN(J) = A(J) * D(IA1(J))
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IAN1(J) = IA1(J)
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90 CONTINUE
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80 CONTINUE
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ELSE IF (toupper(UNITD) .EQ. 'U') THEN
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DO 100 J = 1, IA2(M+1)-1
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AN(J) = A(J)
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IAN1(J) = IA1(J)
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100 CONTINUE
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ENDIF
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9998 CONTINUE
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CALL FCPSB_ERRACTIONRESTORE(ERR_ACT)
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RETURN
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9999 CONTINUE
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CALL FCPSB_ERRACTIONRESTORE(ERR_ACT)
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IF ( ERR_ACT .NE. 0 ) THEN
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CALL FCPSB_SERROR()
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RETURN
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ENDIF
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RETURN
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END
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