Mercurial > octave-nkf
diff libcruft/blas/cdotu.f @ 7789:82be108cc558
First attempt at single precision tyeps
* * *
corrections to qrupdate single precision routines
* * *
prefer demotion to single over promotion to double
* * *
Add single precision support to log2 function
* * *
Trivial PROJECT file update
* * *
Cache optimized hermitian/transpose methods
* * *
Add tests for tranpose/hermitian and ChangeLog entry for new transpose code
| author | David Bateman <dbateman@free.fr> |
|---|---|
| date | Sun, 27 Apr 2008 22:34:17 +0200 |
| parents | |
| children |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/libcruft/blas/cdotu.f Sun Apr 27 22:34:17 2008 +0200 @@ -0,0 +1,51 @@ + COMPLEX FUNCTION CDOTU(N,CX,INCX,CY,INCY) +* .. Scalar Arguments .. + INTEGER INCX,INCY,N +* .. +* .. Array Arguments .. + COMPLEX CX(*),CY(*) +* .. +* +* Purpose +* ======= +* +* CDOTU forms the dot product of two vectors. +* +* Further Details +* =============== +* +* jack dongarra, linpack, 3/11/78. +* modified 12/3/93, array(1) declarations changed to array(*) +* +* .. Local Scalars .. + COMPLEX CTEMP + INTEGER I,IX,IY +* .. + CTEMP = (0.0,0.0) + CDOTU = (0.0,0.0) + IF (N.LE.0) RETURN + IF (INCX.EQ.1 .AND. INCY.EQ.1) GO TO 20 +* +* code for unequal increments or equal increments +* not equal to 1 +* + IX = 1 + IY = 1 + IF (INCX.LT.0) IX = (-N+1)*INCX + 1 + IF (INCY.LT.0) IY = (-N+1)*INCY + 1 + DO 10 I = 1,N + CTEMP = CTEMP + CX(IX)*CY(IY) + IX = IX + INCX + IY = IY + INCY + 10 CONTINUE + CDOTU = CTEMP + RETURN +* +* code for both increments equal to 1 +* + 20 DO 30 I = 1,N + CTEMP = CTEMP + CX(I)*CY(I) + 30 CONTINUE + CDOTU = CTEMP + RETURN + END