LAPACK
3.6.1
LAPACK: Linear Algebra PACKage
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subroutine zlartg | ( | complex*16 | F, |
complex*16 | G, | ||
double precision | CS, | ||
complex*16 | SN, | ||
complex*16 | R | ||
) |
ZLARTG generates a plane rotation with real cosine and complex sine.
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ZLARTG generates a plane rotation so that [ CS SN ] [ F ] [ R ] [ __ ] . [ ] = [ ] where CS**2 + |SN|**2 = 1. [ -SN CS ] [ G ] [ 0 ] This is a faster version of the BLAS1 routine ZROTG, except for the following differences: F and G are unchanged on return. If G=0, then CS=1 and SN=0. If F=0, then CS=0 and SN is chosen so that R is real.
[in] | F | F is COMPLEX*16 The first component of vector to be rotated. |
[in] | G | G is COMPLEX*16 The second component of vector to be rotated. |
[out] | CS | CS is DOUBLE PRECISION The cosine of the rotation. |
[out] | SN | SN is COMPLEX*16 The sine of the rotation. |
[out] | R | R is COMPLEX*16 The nonzero component of the rotated vector. |
3-5-96 - Modified with a new algorithm by W. Kahan and J. Demmel This version has a few statements commented out for thread safety (machine parameters are computed on each entry). 10 feb 03, SJH.
Definition at line 105 of file zlartg.f.