# zsyconv.f - Man Page

SRC/zsyconv.f

## Synopsis

### Functions/Subroutines

subroutine zsyconv (uplo, way, n, a, lda, ipiv, e, info)
ZSYCONV

## Function/Subroutine Documentation

### subroutine zsyconv (character uplo, character way, integer n, complex*16, dimension( lda, * ) a, integer lda, integer, dimension( * ) ipiv, complex*16, dimension( * ) e, integer info)

ZSYCONV

Purpose:

``` ZSYCONV converts A given by ZHETRF into L and D or vice-versa.
Get nondiagonal 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 COMPLEX*16 array, dimension (LDA,N)
The block diagonal matrix D and the multipliers used to
obtain the factor U or L as computed by ZSYTRF.```

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 ZSYTRF.```

E

```          E is COMPLEX*16 array, dimension (N)
E stores the supdiagonal/subdiagonal of the symmetric 1-by-1
or 2-by-2 block diagonal matrix D in LDLT.```

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.

Definition at line 113 of file zsyconv.f.

## Author

Generated automatically by Doxygen for LAPACK from the source code.

## Referenced By

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

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