dlapmt.f File Reference

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

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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.

Download DLAPMT + dependencies [TGZ] [ZIP] [TXT]

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:

[in]	FORWRD	FORWRD is LOGICAL = .TRUE., forward permutation = .FALSE., backward permutation
[in]	M	M is INTEGER The number of rows of the matrix X. M >= 0.
[in]	N	N is INTEGER The number of columns of the matrix X. N >= 0.
[in,out]	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.
[in]	LDX	LDX is INTEGER The leading dimension of the array X, LDX >= MAX(1,M).
[in,out]	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:

September 2012

Definition at line 105 of file dlapmt.f.

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