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DLARTG(l) ) DLARTG(l)
DLARTG - generate a plane rotation so that [ CS SN ]
SUBROUTINE DLARTG( F, G, CS, SN, R )
DOUBLE PRECISION CS, F, G, R, SN
DLARTG generate a plane rotation so that [ CS SN ] . [ F ] = [ R ] where CS**2 + SN**2 =
1. [ -SN CS ] [ G ] [ 0 ]
This is a slower, more accurate version of the BLAS1 routine DROTG, with the following
F and G are unchanged on return.
If G=0, then CS=1 and SN=0.
If F=0 and (G .ne. 0), then CS=0 and SN=1 without doing any
floating point operations (saves work in DBDSQR when
there are zeros on the diagonal).
If F exceeds G in magnitude, CS will be positive.
F (input) DOUBLE PRECISION
The first component of vector to be rotated.
G (input) DOUBLE PRECISION
The second component of vector to be rotated.
CS (output) DOUBLE PRECISION
The cosine of the rotation.
SN (output) DOUBLE PRECISION
The sine of the rotation.
R (output) DOUBLE PRECISION
The nonzero component of the rotated vector.
LAPACK version 3.0 15 June 2000 DLARTG(l)
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