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Diffstat (limited to 'SRC/zlartv.f')
-rw-r--r-- | SRC/zlartv.f | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/SRC/zlartv.f b/SRC/zlartv.f new file mode 100644 index 00000000..ae910b64 --- /dev/null +++ b/SRC/zlartv.f @@ -0,0 +1,78 @@ + SUBROUTINE ZLARTV( N, X, INCX, Y, INCY, C, S, INCC ) +* +* -- LAPACK auxiliary routine (version 3.1) -- +* Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd.. +* November 2006 +* +* .. Scalar Arguments .. + INTEGER INCC, INCX, INCY, N +* .. +* .. Array Arguments .. + DOUBLE PRECISION C( * ) + COMPLEX*16 S( * ), X( * ), Y( * ) +* .. +* +* Purpose +* ======= +* +* ZLARTV applies a vector of complex plane rotations with real cosines +* to elements of the complex vectors x and y. For i = 1,2,...,n +* +* ( x(i) ) := ( c(i) s(i) ) ( x(i) ) +* ( y(i) ) ( -conjg(s(i)) c(i) ) ( y(i) ) +* +* Arguments +* ========= +* +* N (input) INTEGER +* The number of plane rotations to be applied. +* +* X (input/output) COMPLEX*16 array, dimension (1+(N-1)*INCX) +* The vector x. +* +* INCX (input) INTEGER +* The increment between elements of X. INCX > 0. +* +* Y (input/output) COMPLEX*16 array, dimension (1+(N-1)*INCY) +* The vector y. +* +* INCY (input) INTEGER +* The increment between elements of Y. INCY > 0. +* +* C (input) DOUBLE PRECISION array, dimension (1+(N-1)*INCC) +* The cosines of the plane rotations. +* +* S (input) COMPLEX*16 array, dimension (1+(N-1)*INCC) +* The sines of the plane rotations. +* +* INCC (input) INTEGER +* The increment between elements of C and S. INCC > 0. +* +* ===================================================================== +* +* .. Local Scalars .. + INTEGER I, IC, IX, IY + COMPLEX*16 XI, YI +* .. +* .. Intrinsic Functions .. + INTRINSIC DCONJG +* .. +* .. Executable Statements .. +* + IX = 1 + IY = 1 + IC = 1 + DO 10 I = 1, N + XI = X( IX ) + YI = Y( IY ) + X( IX ) = C( IC )*XI + S( IC )*YI + Y( IY ) = C( IC )*YI - DCONJG( S( IC ) )*XI + IX = IX + INCX + IY = IY + INCY + IC = IC + INCC + 10 CONTINUE + RETURN +* +* End of ZLARTV +* + END |