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psblas3/base/serial/coo/zcoonrmi.f

39 lines
946 B
FortranFixed

C ... Compute Infinity norm for sparse matrix in CSR Format ...
DOUBLE PRECISION FUNCTION ZCOONRMI(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, K, NNZ
DOUBLE PRECISION NRMI, SUM
NRMI = 0.0
NNZ = INFOA(1)
I = 1
J = I
DO WHILE (I.LE.NNZ)
DO WHILE ((IA1(J).EQ.IA1(I)).AND.
+ (J.LE.NNZ))
J = J+1
ENDDO
SUM = 0.0
DO K = I, J-1
SUM = SUM + ABS(DBLE(A(K))) + ABS(AIMAG(A(K)))
ENDDO
IF (SUM.GT.NRMI) THEN
NRMI = SUM
ENDIF
I = J
ENDDO
ZCOONRMI = NRMI
END