# dlapmt.f - Man Page

## Synopsis

### Functions/Subroutines

subroutine **dlapmt** (FORWRD, M, **N**, X, LDX, K)**DLAPMT** performs a forward or backward permutation of the columns of a matrix.

## Function/Subroutine Documentation

### subroutine dlapmt (logical FORWRD, integer M, integer N, double precision, dimension( ldx, * ) X, integer LDX, integer, dimension( * ) K)

**DLAPMT** performs a forward or backward permutation of the columns of a matrix.

**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.

**Parameters:***FORWRD*FORWRD is LOGICAL = .TRUE., forward permutation = .FALSE., backward permutation

*M*M is INTEGER The number of rows of the matrix X. M >= 0.

*N*N is INTEGER The number of columns of the matrix X. N >= 0.

*X*X is DOUBLE PRECISION array, dimension (LDX,N) On entry, the M by N matrix X. On exit, X contains the permuted matrix X.

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

*K*K is 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.

**Author:**Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

**Date:**December 2016

Definition at line 106 of file dlapmt.f.

## Author

Generated automatically by Doxygen for LAPACK from the source code.

## Referenced By

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

Tue Nov 14 2017 Version 3.8.0 LAPACK