# dsyconv.f man page

dsyconv.f —

## Synopsis

### Functions/Subroutines

subroutinedsyconv(UPLO, WAY, N, A, LDA, IPIV, WORK, INFO)DSYCONV

## Function/Subroutine Documentation

### subroutine dsyconv (characterUPLO, characterWAY, integerN, double precision, dimension( lda, * )A, integerLDA, integer, dimension( * )IPIV, double precision, dimension( * )WORK, integerINFO)

**DSYCONV**

**Purpose:**

```
DSYCONV 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 DOUBLE PRECISION array, dimension (LDA,N)
The block diagonal matrix D and the multipliers used to
obtain the factor U or L as computed by DSYTRF.
```

*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 DSYTRF.
```

*WORK*

`WORK is DOUBLE PRECISION 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 dsyconv.f.

## Author

Generated automatically by Doxygen for LAPACK from the source code.

## Referenced By

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

Sat Nov 16 2013 Version 3.4.2 LAPACK