SYNOPSIS

SUBROUTINE DLAPMT(

FORWRD, M, N, X, LDX, K )

    

LOGICAL FORWRD

    

INTEGER LDX, M, N

    

INTEGER K( * )

    

DOUBLE PRECISION X( LDX, * )

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.

ARGUMENTS

FORWRD (input) LOGICAL

= .TRUE., forward permutation = .FALSE., backward permutation

M (input) INTEGER

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

N (input) INTEGER

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

X (input/output) DOUBLE PRECISION array, dimension (LDX,N)

On entry, the M by N matrix X. On exit, X contains the permuted matrix X.

LDX (input) INTEGER

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

K (input/output) 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.