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SLARTG(3F)							    SLARTG(3F)

NAME    [Toc]    [Back]

     SLARTG - generate a plane rotation	so that	  [ CS SN ]

SYNOPSIS    [Toc]    [Back]

     SUBROUTINE	SLARTG(	F, G, CS, SN, R	)

	 REAL		CS, F, G, R, SN

PURPOSE    [Toc]    [Back]

     SLARTG generate a plane rotation so that
	[ -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.

ARGUMENTS    [Toc]    [Back]

     F	     (input) REAL
	     The first component of vector to be rotated.

     G	     (input) REAL
	     The second	component of vector to be rotated.

     CS	     (output) REAL
	     The cosine	of the rotation.

     SN	     (output) REAL
	     The sine of the rotation.

     R	     (output) REAL
	     The nonzero component of the rotated vector.
SLARTG(3F)							    SLARTG(3F)

NAME    [Toc]    [Back]

     SLARTG - generate a plane rotation	so that	  [ CS SN ]

SYNOPSIS    [Toc]    [Back]

     SUBROUTINE	SLARTG(	F, G, CS, SN, R	)

	 REAL		CS, F, G, R, SN

PURPOSE    [Toc]    [Back]

     SLARTG generate a plane rotation so that
	[ -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.

ARGUMENTS    [Toc]    [Back]

     F	     (input) REAL
	     The first component of vector to be rotated.

     G	     (input) REAL
	     The second	component of vector to be rotated.

     CS	     (output) REAL
	     The cosine	of the rotation.

     SN	     (output) REAL
	     The sine of the rotation.

     R	     (output) REAL
	     The nonzero component of the rotated vector.


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