LAPACK  3.4.2
LAPACK: Linear Algebra PACKage
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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.

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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