Mercurial > octave-nkf
view libcruft/blas/scasum.f @ 7961:a5d1e27ee1f4 ss-3-1-51
3.1.51 snapshot
author | John W. Eaton <jwe@octave.org> |
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date | Tue, 22 Jul 2008 11:40:48 -0400 |
parents | 82be108cc558 |
children |
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REAL FUNCTION SCASUM(N,CX,INCX) * .. Scalar Arguments .. INTEGER INCX,N * .. * .. Array Arguments .. COMPLEX CX(*) * .. * * Purpose * ======= * * takes the sum of the absolute values of a complex vector and * returns a single precision result. * jack dongarra, linpack, 3/11/78. * modified 3/93 to return if incx .le. 0. * modified 12/3/93, array(1) declarations changed to array(*) * * * .. Local Scalars .. REAL STEMP INTEGER I,NINCX * .. * .. Intrinsic Functions .. INTRINSIC ABS,AIMAG,REAL * .. SCASUM = 0.0e0 STEMP = 0.0e0 IF (N.LE.0 .OR. INCX.LE.0) RETURN IF (INCX.EQ.1) GO TO 20 * * code for increment not equal to 1 * NINCX = N*INCX DO 10 I = 1,NINCX,INCX STEMP = STEMP + ABS(REAL(CX(I))) + ABS(AIMAG(CX(I))) 10 CONTINUE SCASUM = STEMP RETURN * * code for increment equal to 1 * 20 DO 30 I = 1,N STEMP = STEMP + ABS(REAL(CX(I))) + ABS(AIMAG(CX(I))) 30 CONTINUE SCASUM = STEMP RETURN END