MA02CZ

Pertransposing the central band of a square matrix (complex case)

[Specification] [Arguments] [Method] [References] [Comments] [Example]

Purpose

```  To compute the pertranspose of a central band of a square matrix.

```
Specification
```      SUBROUTINE MA02CZ( N, KL, KU, A, LDA )
C     .. Scalar Arguments ..
INTEGER          KL, KU, LDA, N
C     .. Array Arguments ..
COMPLEX*16       A(LDA,*)

```
Arguments

Input/Output Parameters

```  N       (input) INTEGER
The order of the square matrix A.  N >= 0.

KL      (input) INTEGER
The number of subdiagonals of A to be pertransposed.
0 <= KL <= N-1.

KU      (input) INTEGER
The number of superdiagonals of A to be pertransposed.
0 <= KU <= N-1.

A       (input/output) COMPLEX*16 array, dimension (LDA,N)
On entry, the leading N-by-N part of this array must
contain a square matrix whose central band formed from
the KL subdiagonals, the main diagonal and the KU
superdiagonals will be pertransposed.
On exit, the leading N-by-N part of this array contains
the matrix A with its central band (the KL subdiagonals,
the main diagonal and the KU superdiagonals) pertransposed
(that is the elements of each antidiagonal appear in
reversed order). This is equivalent to forming P*B'*P,
where B is the matrix formed from the central band of A
and P is a permutation matrix with ones down the secondary
diagonal.

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

```
```  None
```
Example

Program Text

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Program Data
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Program Results
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