# ssyconv.f

## NAME

ssyconv.f −

## SYNOPSIS

**Functions/Subroutines**

subroutine **ssyconv** (UPLO, WAY, N, A, LDA, IPIV, WORK, INFO)

SSYCONV

## Function/Subroutine Documentation

**subroutine ssyconv (characterUPLO, characterWAY, integerN, real, dimension( lda, * )A, integerLDA, integer, dimension( * )IPIV, real, dimension( * )WORK, integerINFO)**

SSYCONV

**Purpose:**

SSYCONV convert A given by TRF into L and D and vice-versa.

Get Non-diag elements of D (returned in workspace) and

apply or reverse permutation done in TRF.

**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.

*WAY*

WAY is CHARACTER*1

= ’C’: Convert

= ’R’: Revert

*N*

N is INTEGER

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

*A*

A is REAL array, dimension (LDA,N)

The block diagonal matrix D and the multipliers used to

obtain the factor U or L as computed by SSYTRF.

*LDA*

LDA is INTEGER

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

*IPIV*

IPIV is INTEGER array, dimension (N)

Details of the interchanges and the block structure of D

as determined by SSYTRF.

*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

**Author:**

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

**Date:**

November 2011

Definition at line 113 of file ssyconv.f.

## Author

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