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psblas3/base/serial/csr/zcrnrmi.f

33 lines
769 B
FortranFixed

DOUBLE PRECISION FUNCTION ZCRNRMI(TRANS,M,N,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
COMPLEX*16 A(*)
C .. Local scalars ..
INTEGER I, J
DOUBLE PRECISION NRMI, SUM
NRMI = 0.D0
DO I = 1, M
SUM = 0.D0
DO J = IA2(I), IA2(I+1)-1
C
C .. definition coerent abs
C
C SUM = SUM + ABS(A(J))
C
C .. essl_way abs
C
SUM = SUM + ABS(DBLE(A(J))) + ABS(AIMAG(A(J)))
ENDDO
NRMI = MAX(NRMI, SUM)
ENDDO
ZCRNRMI = NRMI
END