dsptri.f man page on RedHat

Man page or keyword search:  
man Server   29550 pages
apropos Keyword Search (all sections)
Output format
RedHat logo
[printable version]

dsptri.f(3)			    LAPACK			   dsptri.f(3)

NAME
       dsptri.f -

SYNOPSIS
   Functions/Subroutines
       subroutine dsptri (UPLO, N, AP, IPIV, WORK, INFO)
	   DSPTRI

Function/Subroutine Documentation
   subroutine dsptri (characterUPLO, integerN, double precision, dimension( *
       )AP, integer, dimension( * )IPIV, double precision, dimension( * )WORK,
       integerINFO)
       DSPTRI

       Purpose:

	    DSPTRI computes the inverse of a real symmetric indefinite matrix
	    A in packed storage using the factorization A = U*D*U**T or
	    A = L*D*L**T computed by DSPTRF.

       Parameters:
	   UPLO

		     UPLO is CHARACTER*1
		     Specifies whether the details of the factorization are stored
		     as an upper or lower triangular matrix.
		     = 'U':  Upper triangular, form is A = U*D*U**T;
		     = 'L':  Lower triangular, form is A = L*D*L**T.

	   N

		     N is INTEGER
		     The order of the matrix A.	 N >= 0.

	   AP

		     AP is DOUBLE PRECISION array, dimension (N*(N+1)/2)
		     On entry, the block diagonal matrix D and the multipliers
		     used to obtain the factor U or L as computed by DSPTRF,
		     stored as a packed triangular matrix.

		     On exit, if INFO = 0, the (symmetric) inverse of the original
		     matrix, stored as a packed triangular matrix. The j-th column
		     of inv(A) is stored in the array AP as follows:
		     if UPLO = 'U', AP(i + (j-1)*j/2) = inv(A)(i,j) for 1<=i<=j;
		     if UPLO = 'L',
			AP(i + (j-1)*(2n-j)/2) = inv(A)(i,j) for j<=i<=n.

	   IPIV

		     IPIV is INTEGER array, dimension (N)
		     Details of the interchanges and the block structure of D
		     as determined by DSPTRF.

	   WORK

		     WORK is DOUBLE PRECISION array, dimension (N)

	   INFO

		     INFO is INTEGER
		     = 0: successful exit
		     < 0: if INFO = -i, the i-th argument had an illegal value
		     > 0: if INFO = i, D(i,i) = 0; the matrix is singular and its
			  inverse could not be computed.

       Author:
	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

       Date:
	   November 2011

       Definition at line 110 of file dsptri.f.

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

Version 3.4.2			Tue Sep 25 2012			   dsptri.f(3)
[top]

List of man pages available for RedHat

Copyright (c) for man pages and the logo by the respective OS vendor.

For those who want to learn more, the polarhome community provides shell access and support.

[legal] [privacy] [GNU] [policy] [cookies] [netiquette] [sponsors] [FAQ]
Tweet
Polarhome, production since 1999.
Member of Polarhome portal.
Based on Fawad Halim's script.
....................................................................
Vote for polarhome
Free Shell Accounts :: the biggest list on the net