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psblas3/base/serial/f77/zcsnmi.f

151 lines
4.4 KiB
Fortran

C DOUBLE PRECISION FUNCTION ZCSNMI(TRANS,M,N,FIDA,DESCRA,A,IA1,IA2, &
C & INFOA,IERROR)
C Purpose
C =======
C
C Computing matrix infinity norm
C nrmi <-- ||A||infty or
C nrmi <-- ||At||infty
C
C Parameters
C ==========
C
C TRANS - CHARACTER*1
C On entry TRANS specifies if the routine operates with matrix A
C or with the transpose of A as follows:
C TRANS = 'N' -> use matrix A
C TRANS = 'T' or 'C' -> use A' (transpose of matrix A)
C Unchanged on exit.
C
C M - INTEGER
C On entry: number of rows of matrix A (A')
C Unchanged on exit.
C
C N - INTEGER
C On entry: number of columns of matrix A.
C Unchanged on exit.
C
C FIDA - CHARACTER*5
C On entry FIDA defines the format of the input sparse matrix.
C Unchanged on exit.
C
C DESCRA - CHARACTER*1 array of DIMENSION (9)
C On entry DESCRA describes the characteristics of the input
C sparse matrix.
C Unchanged on exit.
C
C A - DOUBLE PRECISION array of DIMENSION (*)
C On entry A specifies the values of the input sparse
C matrix.
C Unchanged on exit.
C
C IA1 - INTEGER array of dimension (*)
C On entry IA1 holds integer information on input sparse
C matrix. Actual information will depend on data format used.
C Unchanged on exit.
C
C IA2 - INTEGER array of dimension (*)
C On entry IA2 holds integer information on input sparse
C matrix. Actual information will depend on data format used.
C Unchanged on exit.
C
C INFOA - INTEGER array of length 10.
C On entry can hold auxiliary information on input matrices
C formats or environment of subsequent calls.
C Might be changed on exit.
C
C IERROR - INTEGER
C On exit IERROR contains the value of error flag as follows:
C IERROR = 0 no error
C IERROR > 0 warning
C IERROR < 0 fatal error
C
C Notes
C =====
C
DOUBLE PRECISION FUNCTION ZCSNMI(TRANS,M,N,FIDA,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, FIDA*5
COMPLEX*16 A(*)
C .. Local Array..
INTEGER INT_VAL(5), ERR_ACT
DOUBLE PRECISION REAL_VAL(5)
CHARACTER*30 NAME, STRINGS(2)
C .. External Subroutines ..
DOUBLE PRECISION ZCRNRMI, ZCOONRMI
EXTERNAL ZCRNRMI, ZCOONRMI
C .. Executable Statements ..
C
C Check for argument errors
C
IERROR = 0
NAME = 'ZCSNMI\0'
CALL FCPSB_ERRACTIONSAVE(ERR_ACT)
IF (M.LT.0) THEN
IERROR = 10
INT_VAL(1) = 2
INT_VAL(2) = M
ELSE IF (N.LT.0) THEN
IERROR = 10
INT_VAL(1) = 3
INT_VAL(2) = N
ELSE IF (TRANS.NE.'T' .AND. TRANS.NE.'N' .AND. TRANS.NE.'C') THEN
IERROR = 40
INT_VAL(1) = 1
STRINGS(1) = TRANS//'\0'
ENDIF
C
C Error handling
C
IF(IERROR.NE.0) THEN
CALL FCPSB_ERRPUSH(IERROR,NAME,INT_VAL)
GOTO 9999
ENDIF
C
C Check for M, N, K
C
IF(M.LE.0 .OR. N.LE.0) THEN
ZCSNMI = 0.D0
GOTO 9999
ENDIF
C ... Compute infinity norm for matrix A ...
IF (FIDA(1:3).EQ.'CSR') THEN
ZCSNMI = ZCRNRMI(TRANS,M,N,DESCRA,A,IA1,IA2,
+ INFOA,IERROR)
c$$$ ELSE IF (FIDA(1:3).EQ.'JAD') THEN
c$$$ ZCSNMI = ZJDNRMI(TRANS,M,N,DESCRA,A,IA1,IA2,
c$$$ + INFOA,IERROR)
ELSE IF (FIDA(1:3).EQ.'COO') THEN
ZCSNMI = ZCOONRMI(TRANS,M,N,DESCRA,A,IA1,IA2,
+ INFOA,IERROR)
ELSE
C
C This data structure not yet considered
C
IERROR = 3010
CALL FCPSB_ERRPUSH(IERROR,NAME,INT_VAL)
GOTO 9999
ENDIF
CALL FCPSB_ERRACTIONRESTORE(ERR_ACT)
RETURN
9999 CONTINUE
CALL FCPSB_ERRACTIONRESTORE(ERR_ACT)
IF ( ERR_ACT .NE. 0 ) THEN
CALL FCPSB_SERROR()
RETURN
ENDIF
RETURN
END