NAME¶

/home/abuild/rpmbuild/BUILD/lapack-3.12.0/SRC/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 (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.

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.

Definition at line 103 of file dlapmt.f.

Author¶

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