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Full Discussion: processing matrix column wise
Top Forums Shell Programming and Scripting processing matrix column wise Post 302132909 by Abhishek Ghose on Tuesday 21st of August 2007 12:20:29 AM
Old 08-21-2007
risk of overflow?
First of all, thanks for the response.

The order of my matrix is curently 2000 X 1000....but it might increase over time. Is there a possibility of memory overflow? This is one reason why I didnt want to store many values in a code... preferable is if I could process them and output as they come, maintaining the minimum number of variables in the code.
 

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LEARN ABOUT CENTOS

slas2.f

slas2.f(3)							      LAPACK								slas2.f(3)

NAME

       slas2.f -

SYNOPSIS

   Functions/Subroutines
       subroutine slas2 (F, G, H, SSMIN, SSMAX)
	   SLAS2 computes singular values of a 2-by-2 triangular matrix.

Function/Subroutine Documentation
   subroutine slas2 (realF, realG, realH, realSSMIN, realSSMAX)
       SLAS2 computes singular values of a 2-by-2 triangular matrix.

       Purpose:

	    SLAS2  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 REAL
		     The (1,1) element of the 2-by-2 matrix.

	   G

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

	   H

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

	   SSMIN

		     SSMIN is REAL
		     The smaller singular value.

	   SSMAX

		     SSMAX is REAL
		     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 slas2.f.

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

Version 3.4.2							  Tue Sep 25 2012							slas2.f(3)
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