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CentOS 7.0 - man page for ssptri (centos section 3)

ssptri.f(3)				      LAPACK				      ssptri.f(3)

NAME
       ssptri.f -

SYNOPSIS
   Functions/Subroutines
       subroutine ssptri (UPLO, N, AP, IPIV, WORK, INFO)
	   SSPTRI

Function/Subroutine Documentation
   subroutine ssptri (characterUPLO, integerN, real, dimension( * )AP, integer, dimension( *
       )IPIV, real, dimension( * )WORK, integerINFO)
       SSPTRI

       Purpose:

	    SSPTRI 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 SSPTRF.

       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 REAL 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 SSPTRF,
		     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 SSPTRF.

	   WORK

		     WORK is REAL 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 ssptri.f.

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

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


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