dlapmt-f(3)

dlapmt.f –

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 (logicalFORWRD, integerM, integerN, double precision, dimension( ldx, * )X, integerLDX, 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 is INTEGER
 The number of rows of the matrix X. M >= 0.

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

 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 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:

September 2012

Definition at line 105 of file dlapmt.f.

Author

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