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151 lines
4.4 KiB
Fortran
151 lines
4.4 KiB
Fortran
C DOUBLE PRECISION FUNCTION ZCSNMI(TRANS,M,N,FIDA,DESCRA,A,IA1,IA2, &
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C & INFOA,IERROR)
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C Purpose
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C =======
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C
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C Computing matrix infinity norm
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C nrmi <-- ||A||infty or
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C nrmi <-- ||At||infty
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C
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C Parameters
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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 if the routine operates with matrix A
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C or with the transpose of A as follows:
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C TRANS = 'N' -> use matrix A
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C TRANS = 'T' or 'C' -> use A' (transpose of matrix 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 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.
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C Unchanged on exit.
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C
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C FIDA - CHARACTER*5
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C On entry FIDA defines the format of the input sparse matrix.
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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 length 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 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 warning
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C IERROR < 0 fatal error
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C
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C Notes
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C =====
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C
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DOUBLE PRECISION FUNCTION ZCSNMI(TRANS,M,N,FIDA,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, FIDA*5
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COMPLEX*16 A(*)
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C .. Local Array..
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INTEGER INT_VAL(5), ERR_ACT
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DOUBLE PRECISION REAL_VAL(5)
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CHARACTER*30 NAME, STRINGS(2)
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C .. External Subroutines ..
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DOUBLE PRECISION ZCRNRMI, ZCOONRMI
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EXTERNAL ZCRNRMI, ZCOONRMI
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C .. Executable Statements ..
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C
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C Check for argument errors
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C
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IERROR = 0
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NAME = 'ZCSNMI\0'
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CALL FCPSB_ERRACTIONSAVE(ERR_ACT)
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IF (M.LT.0) THEN
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IERROR = 10
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INT_VAL(1) = 2
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INT_VAL(2) = M
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ELSE IF (N.LT.0) THEN
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IERROR = 10
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INT_VAL(1) = 3
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INT_VAL(2) = N
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ELSE IF (TRANS.NE.'T' .AND. TRANS.NE.'N' .AND. TRANS.NE.'C') THEN
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IERROR = 40
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INT_VAL(1) = 1
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STRINGS(1) = TRANS//'\0'
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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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ENDIF
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C
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C Check for M, N, K
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C
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IF(M.LE.0 .OR. N.LE.0) THEN
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ZCSNMI = 0.D0
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GOTO 9999
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ENDIF
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C ... Compute infinity norm for matrix A ...
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IF (FIDA(1:3).EQ.'CSR') THEN
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ZCSNMI = ZCRNRMI(TRANS,M,N,DESCRA,A,IA1,IA2,
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+ INFOA,IERROR)
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c$$$ ELSE IF (FIDA(1:3).EQ.'JAD') THEN
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c$$$ ZCSNMI = ZJDNRMI(TRANS,M,N,DESCRA,A,IA1,IA2,
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c$$$ + INFOA,IERROR)
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ELSE IF (FIDA(1:3).EQ.'COO') THEN
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ZCSNMI = ZCOONRMI(TRANS,M,N,DESCRA,A,IA1,IA2,
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+ INFOA,IERROR)
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ELSE
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C
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C This data structure not yet considered
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C
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IERROR = 3010
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CALL FCPSB_ERRPUSH(IERROR,NAME,INT_VAL)
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GOTO 9999
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ENDIF
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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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