# 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

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