# lapmt - Man Page

lapmt: permute cols

## Synopsis

### Functions

subroutine **clapmt** (forwrd, m, n, x, ldx, k)**CLAPMT** performs a forward or backward permutation of the columns of a matrix.

subroutine **dlapmt** (forwrd, m, n, x, ldx, k)**DLAPMT** performs a forward or backward permutation of the columns of a matrix.

subroutine **slapmt** (forwrd, m, n, x, ldx, k)**SLAPMT** performs a forward or backward permutation of the columns of a matrix.

subroutine **zlapmt** (forwrd, m, n, x, ldx, k)**ZLAPMT** performs a forward or backward permutation of the columns of a matrix.

## Detailed Description

## Function Documentation

### subroutine clapmt (logical forwrd, integer m, integer n, complex, dimension( ldx, * ) x, integer ldx, integer, dimension( * ) k)

**CLAPMT** performs a forward or backward permutation of the columns of a matrix.

**Purpose:**

CLAPMT 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*M is INTEGER The number of rows of the matrix X. M >= 0.

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

*X*X is COMPLEX 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*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 **clapmt.f**.

### 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*M is INTEGER The number of rows of the matrix X. M >= 0.

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

*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.

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

*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.

Definition at line **103** of file **dlapmt.f**.

### subroutine slapmt (logical forwrd, integer m, integer n, real, dimension( ldx, * ) x, integer ldx, integer, dimension( * ) k)

**SLAPMT** performs a forward or backward permutation of the columns of a matrix.

**Purpose:**

SLAPMT 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*M is INTEGER The number of rows of the matrix X. M >= 0.

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

*X*X is REAL 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*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 **slapmt.f**.

### subroutine zlapmt (logical forwrd, integer m, integer n, complex*16, dimension( ldx, * ) x, integer ldx, integer, dimension( * ) k)

**ZLAPMT** performs a forward or backward permutation of the columns of a matrix.

**Purpose:**

ZLAPMT 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*M is INTEGER The number of rows of the matrix X. M >= 0.

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

*X*X is COMPLEX*16 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***Author**Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Definition at line **103** of file **zlapmt.f**.

## Author

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