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CentOS 7.0 - man page for dlas2.f (centos section 3)

dlas2.f(3)				      LAPACK				       dlas2.f(3)

NAME
       dlas2.f -

SYNOPSIS
   Functions/Subroutines
       subroutine dlas2 (F, G, H, SSMIN, SSMAX)
	   DLAS2 computes singular values of a 2-by-2 triangular matrix.

Function/Subroutine Documentation
   subroutine dlas2 (double precisionF, double precisionG, double precisionH, double
       precisionSSMIN, double precisionSSMAX)
       DLAS2 computes singular values of a 2-by-2 triangular matrix.

       Purpose:

	    DLAS2  computes the singular values of the 2-by-2 matrix
	       [  F   G  ]
	       [  0   H  ].
	    On return, SSMIN is the smaller singular value and SSMAX is the
	    larger singular value.

       Parameters:
	   F

		     F is DOUBLE PRECISION
		     The (1,1) element of the 2-by-2 matrix.

	   G

		     G is DOUBLE PRECISION
		     The (1,2) element of the 2-by-2 matrix.

	   H

		     H is DOUBLE PRECISION
		     The (2,2) element of the 2-by-2 matrix.

	   SSMIN

		     SSMIN is DOUBLE PRECISION
		     The smaller singular value.

	   SSMAX

		     SSMAX is DOUBLE PRECISION
		     The larger singular value.

       Author:
	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

       Date:
	   September 2012

       Further Details:

	     Barring over/underflow, all output quantities are correct to within
	     a few units in the last place (ulps), even in the absence of a guard
	     digit in addition/subtraction.

	     In IEEE arithmetic, the code works correctly if one matrix element is
	     infinite.

	     Overflow will not occur unless the largest singular value itself
	     overflows, or is within a few ulps of overflow. (On machines with
	     partial overflow, like the Cray, overflow may occur if the largest
	     singular value is within a factor of 2 of overflow.)

	     Underflow is harmless if underflow is gradual. Otherwise, results
	     may correspond to a matrix modified by perturbations of size near
	     the underflow threshold.

       Definition at line 108 of file dlas2.f.

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

Version 3.4.2				 Tue Sep 25 2012			       dlas2.f(3)


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