LAPACK  3.4.2 LAPACK: Linear Algebra PACKage
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.

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.

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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.
Date:
September 2012

Definition at line 105 of file dlapmt.f.

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