.TH SLARTG l "15 June 2000" "LAPACK version 3.0" ")"
.SH NAME
SLARTG - generate a plane rotation so that  [ CS SN ] 
.SH SYNOPSIS
.TP 19
SUBROUTINE SLARTG(
F, G, CS, SN, R )
.TP 19
.ti +4
REAL
CS, F, G, R, SN
.SH PURPOSE
SLARTG generate a plane rotation so that [ CS SN ] . [ F ] = [ R ] where CS**2 + SN**2 = 1.    [ -SN  CS  ]     [ G ]     [ 0 ]
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This is a slower, more accurate version of the BLAS1 routine SROTG,
with the following other differences:
.br
   F and G are unchanged on return.
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   If G=0, then CS=1 and SN=0.
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   If F=0 and (G .ne. 0), then CS=0 and SN=1 without doing any
      floating point operations (saves work in SBDSQR when
      there are zeros on the diagonal).
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If F exceeds G in magnitude, CS will be positive.
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.SH ARGUMENTS
.TP 8
F       (input) REAL
The first component of vector to be rotated.
.TP 8
G       (input) REAL
The second component of vector to be rotated.
.TP 8
CS      (output) REAL
The cosine of the rotation.
.TP 8
SN      (output) REAL
The sine of the rotation.
.TP 8
R       (output) REAL
The nonzero component of the rotated vector.