debian man page for slartgs

slartgs.f(3)							      LAPACK							      slartgs.f(3)

NAME
       slartgs.f -

SYNOPSIS
   Functions/Subroutines
       subroutine slartgs (X, Y, SIGMA, CS, SN)
	   SLARTGS

Function/Subroutine Documentation
   subroutine slartgs (realX, realY, realSIGMA, realCS, realSN)
       SLARTGS

       Purpose:

	    SLARTGS generates a plane rotation designed to introduce a bulge in
	    Golub-Reinsch-style implicit QR iteration for the bidiagonal SVD
	    problem. X and Y are the top-row entries, and SIGMA is the shift.
	    The computed CS and SN define a plane rotation satisfying

	       [  CS  SN  ]  .	[ X^2 - SIGMA ]  =  [ R ],
	       [ -SN  CS  ]	[    X * Y    ]     [ 0 ]

	    with R nonnegative.  If X^2 - SIGMA and X * Y are 0, then the
	    rotation is by PI/2.

       Parameters:
	   X

		     X is REAL
		     The (1,1) entry of an upper bidiagonal matrix.

	   Y

		     Y is REAL
		     The (1,2) entry of an upper bidiagonal matrix.

	   SIGMA

		     SIGMA is REAL
		     The shift.

	   CS

		     CS is REAL
		     The cosine of the rotation.

	   SN

		     SN is REAL
		     The sine of the rotation.

       Author:
	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

       Date:
	   November 2011

       Definition at line 91 of file slartgs.f.

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

Version 3.4.1							  Sun May 26 2013						      slartgs.f(3)