---
name: "dlapmt"
section: "3lapack"
platform: "linux"
package: "liblapack-doc"
version: "3.2.1-8"
release: "Debian 6.0 (Squeeze)"
platforms: ["linux"]
url: "https://new.carta.tech/dlapmt/3lapack"
---

# dlapmt(3lapack)

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

DLAPMT - 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 DLAPMT(

  FORWRD, M, N, X, LDX, K )

- LOGICAL

  FORWRD

- INTEGER

  LDX, M, N

- INTEGER

  K( \* )

- DOUBLE

  PRECISION X( LDX, \* )

## PURPOSE

DLAPMT 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) DOUBLE PRECISION 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.