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dlartgp

dlartgp.f(3)							      LAPACK							      dlartgp.f(3)

NAME

       dlartgp.f -

SYNOPSIS

   Functions/Subroutines
       subroutine dlartgp (F, G, CS, SN, R)
	   DLARTGP generates a plane rotation so that the diagonal is nonnegative.

Function/Subroutine Documentation
   subroutine dlartgp (double precisionF, double precisionG, double precisionCS, double precisionSN, double precisionR)
       DLARTGP generates a plane rotation so that the diagonal is nonnegative.

       Purpose:

	    DLARTGP generates 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 Level 1 BLAS 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.

	    The sign is chosen so that R >= 0.

       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 96 of file dlartgp.f.

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

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