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CentOS 7.0 - man page for dlartg.f (centos section 3)

dlartg.f(3)				      LAPACK				      dlartg.f(3)

NAME
       dlartg.f -

SYNOPSIS
   Functions/Subroutines
       subroutine dlartg (F, G, CS, SN, R)
	   DLARTG generates a plane rotation with real cosine and real sine.

Function/Subroutine Documentation
   subroutine dlartg (double precisionF, double precisionG, double precisionCS, double
       precisionSN, double precisionR)
       DLARTG generates a plane rotation with real cosine and real sine.

       Purpose:

	    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 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 DBDSQR when
		  there are zeros on the diagonal).

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

       Parameters:
	   F

		     F is DOUBLE PRECISION
		     The first component of vector to be rotated.

	   G

		     G is DOUBLE PRECISION
		     The second component of vector to be rotated.

	   CS

		     CS is DOUBLE PRECISION
		     The cosine of the rotation.

	   SN

		     SN is DOUBLE PRECISION
		     The sine of the rotation.

	   R

		     R is DOUBLE PRECISION
		     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 dlartg.f.

Author
       Generated automatically by Doxygen for LAPACK from the source code.

Version 3.4.2				 Tue Sep 25 2012			      dlartg.f(3)


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