# spotri.f - Man Page

SRC/spotri.f

## Synopsis

### Functions/Subroutines

subroutine **spotri** (uplo, n, a, lda, info)**SPOTRI**

## Function/Subroutine Documentation

### subroutine spotri (character uplo, integer n, real, dimension( lda, * ) a, integer lda, integer info)

**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.

Definition at line **94** of file **spotri.f**.

## Author

Generated automatically by Doxygen for LAPACK from the source code.

## Referenced By

The man page spotri(3) is an alias of spotri.f(3).

Tue Nov 28 2023 12:08:42 Version 3.12.0 LAPACK