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RedHat 9 (Linux i386) - man page for slartg (redhat section l)

SLARTG(l)					)					SLARTG(l)

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

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

	   REAL 	  CS, F, G, R, SN

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.

ARGUMENTS
       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.

LAPACK version 3.0			   15 June 2000 				SLARTG(l)


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