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author | julie <julielangou@users.noreply.github.com> | 2008-12-16 17:06:58 +0000 |
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committer | julie <julielangou@users.noreply.github.com> | 2008-12-16 17:06:58 +0000 |
commit | ff981f106bde4ce6a74aa4f4a572c943f5a395b2 (patch) | |
tree | a386cad907bcaefd6893535c31d67ec9468e693e /SRC/zlarscl2.f | |
parent | e58b61578b55644f6391f3333262b72c1dc88437 (diff) | |
download | lapack-ff981f106bde4ce6a74aa4f4a572c943f5a395b2.tar.gz lapack-ff981f106bde4ce6a74aa4f4a572c943f5a395b2.tar.bz2 lapack-ff981f106bde4ce6a74aa4f4a572c943f5a395b2.zip |
Diffstat (limited to 'SRC/zlarscl2.f')
-rw-r--r-- | SRC/zlarscl2.f | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/SRC/zlarscl2.f b/SRC/zlarscl2.f new file mode 100644 index 00000000..c5af11a2 --- /dev/null +++ b/SRC/zlarscl2.f @@ -0,0 +1,54 @@ + SUBROUTINE ZLARSCL2 ( M, N, D, X, LDX ) +* +* -- LAPACK routine (version 3.2) -- +* -- Contributed by James Demmel, Deaglan Halligan, Yozo Hida and -- +* -- Jason Riedy of Univ. of California Berkeley. -- +* -- November 2008 -- +* +* -- LAPACK is a software package provided by Univ. of Tennessee, -- +* -- Univ. of California Berkeley and NAG Ltd. -- +* + IMPLICIT NONE +* .. +* .. Scalar Arguments .. + INTEGER M, N, LDX +* .. +* .. Array Arguments .. + COMPLEX*16 X( LDX, * ) + DOUBLE PRECISION D( * ) +* .. +* +* Purpose +* ======= +* +* ZLARSCL2 performs a reciprocal diagonal scaling on an vector: +* x <-- inv(D) * x +* where the diagonal matrix D is stored as a vector. +* Eventually to be replaced by BLAS_sge_diag_scale in the new BLAS +* standard. +* +* Arguments +* ========= +* N (input) INTEGER +* The size of the vectors X and D. +* +* D (input) DOUBLE PRECISION array, length N +* Diagonal matrix D, stored as a vector of length N. +* X (input/output) COMPLEX*16 array, length N +* On entry, the vector X to be scaled by D. +* On exit, the scaled vector. +* .. +* .. Local Scalars .. + INTEGER I, J +* .. +* .. Executable Statements .. +* + DO J = 1, N + DO I = 1, M + X(I,J) = X(I,J) / D(I) + END DO + END DO +* + RETURN + END +* |