spotri.f man page

spotri.f —

Synopsis

Functions/Subroutines

subroutine spotri (UPLO, N, A, LDA, INFO)
SPOTRI

Function/Subroutine Documentation

subroutine spotri (characterUPLO, integerN, real, dimension( lda, * )A, integerLDA, integerINFO)

SPOTRI

Purpose:

SPOTRI computes the inverse of a real symmetric positive definite
matrix A using the Cholesky factorization A = U**T*U or A = L*L**T
computed by SPOTRF.

Parameters:

UPLO

UPLO is CHARACTER*1
= 'U':  Upper triangle of A is stored;
= 'L':  Lower triangle of A is stored.

N

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

A

A is REAL array, dimension (LDA,N)
On entry, the triangular factor U or L from the Cholesky
factorization A = U**T*U or A = L*L**T, as computed by
SPOTRF.
On exit, the upper or lower triangle of the (symmetric)
inverse of A, overwriting the input factor U or L.

LDA

LDA is INTEGER
The leading dimension of the array A.  LDA >= max(1,N).

INFO

INFO is INTEGER
= 0:  successful exit
< 0:  if INFO = -i, the i-th argument had an illegal value
> 0:  if INFO = i, the (i,i) element of the factor U or L is
      zero, and the 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 96 of file spotri.f.

Author

Generated automatically by Doxygen for LAPACK from the source code.

Referenced By

spotri(3) is an alias of spotri.f(3).

Sat Nov 16 2013 Version 3.4.2 LAPACK