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# LAPACK-3

## man page of LAPACK-3

### LAPACK-3: rearranges the columns of the M by N matrix X as specified by the permutation K(1),K(2),...,K(N) of the integers 1,...,N

```NAME
LAPACK-3  -  rearranges the columns of the M by N matrix X as specified
by the permutation K(1),K(2),...,K(N) of the integers 1,...,N

SYNOPSIS
SUBROUTINE ZLAPMT( FORWRD, M, N, X, LDX, K )

LOGICAL        FORWRD

INTEGER        LDX, M, N

INTEGER        K( * )

COMPLEX*16     X( LDX, * )

PURPOSE
ZLAPMT rearranges the columns of the M by N matrix X  as  specified  by
the permutation K(1),K(2),...,K(N) of the integers 1,...,N.
If FORWRD = .TRUE.,  forward permutation:
X(*,K(J)) is moved X(*,J) for J = 1,2,...,N.
If FORWRD = .FALSE., backward permutation:
X(*,J) is moved to X(*,K(J)) for J = 1,2,...,N.

ARGUMENTS
FORWRD  (input) LOGICAL
= .TRUE., forward permutation
= .FALSE., backward permutation

M       (input) INTEGER
The number of rows of the matrix X. M >= 0.

N       (input) INTEGER
The number of columns of the matrix X. N >= 0.

X       (input/output) COMPLEX*16 array, dimension (LDX,N)
On entry, the M by N matrix X.
On exit, X contains the permuted matrix X.

LDX     (input) INTEGER
The leading dimension of the array X, LDX >= MAX(1,M).

K       (input/output) INTEGER array, dimension (N)
On entry, K contains the permutation vector. K is used as
internal workspace, but reset to its original value on
output.

LAPACK auxiliary routine (versionMarch 2011                       LAPACK-3(3)
```