Functions/Subroutines
subroutine	slartg (F, G, CS, SN, R)
	SLARTG generates a plane rotation with real cosine and real sine. More...

Function/Subroutine Documentation

subroutine slartg	(	real	F,
		real	G,
		real	CS,
		real	SN,
		real	R
	)

SLARTG generates a plane rotation with real cosine and real sine.

Download SLARTG + dependencies [TGZ] [ZIP] [TXT]

Purpose:

 SLARTG 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 SROTG,
 with the following other differences:
    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 SBDSQR when
       there are zeros on the diagonal).

 If F exceeds G in magnitude, CS will be positive.

Parameters

[in]	F	F is REAL The first component of vector to be rotated.
[in]	G	G is REAL The second component of vector to be rotated.
[out]	CS	CS is REAL The cosine of the rotation.
[out]	SN	SN is REAL The sine of the rotation.
[out]	R	R is REAL The nonzero component of the rotated vector. This version has a few statements commented out for thread safety (machine parameters are computed on each entry). 10 feb 03, SJH.

Author: Univ. of Tennessee; Univ. of California Berkeley; Univ. of Colorado Denver; NAG Ltd.

Date: September 2012

Definition at line 98 of file slartg.f.

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