?lapmt

Developer Reference for Intel® oneAPI Math Kernel Library for C

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ID 766684

Date 4/28/2026

Version

Public

?lapmt

Performs a forward or backward permutation of the columns of a matrix.

Syntax

lapack_intLAPACKE_slapmt ( intmatrix_layout , lapack_logicalforwrd , lapack_intm , lapack_intn , float*x , lapack_intldx , lapack_int*k );

lapack_intLAPACKE_dlapmt ( intmatrix_layout , lapack_logicalforwrd , lapack_intm , lapack_intn , double*x , lapack_intldx , lapack_int*k );

lapack_intLAPACKE_clapmt ( intmatrix_layout , lapack_logicalforwrd , lapack_intm , lapack_intn , lapack_complex_float*x , lapack_intldx , lapack_int*k );

lapack_intLAPACKE_zlapmt ( intmatrix_layout , lapack_logicalforwrd , lapack_intm , lapack_intn , lapack_complex_double*x , lapack_intldx , lapack_int*k );

Include Files

mkl.h

Description

The routine ?lapmt 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,...,nk[i - 1] for i = 1,...,n .

If forwrd= .TRUE.≠ 0 , forward permutation:

X(*,k(j)) is moved to X(*,j) for j=1,2,...,n .

If forwrd = 0 , backward permutation:

X(*,j) is moved to X(*,k(j)) for j = 1,2,...,n .

Input Parameters

matrix_layout: Specifies whether matrix storage layout is row major ( LAPACK_ROW_MAJOR ) or column major ( LAPACK_COL_MAJOR ).

forwrd

LOGICAL . If forwrd= .TRUE.≠ 0 , forward permutation

If forwrd = 0 , backward permutation

m

The number of rows of the matrix X . m≥ 0 .

n

The number of columns of the matrix X . n≥ 0 .

x

REAL for slapmt DOUBLE PRECISION for dlapmt COMPLEX for clapmt DOUBLE COMPLEX for zlapmt

Array, size ldx * n . On entry, the m -by- n matrix X .

ldx

The leading dimension of the array x , ldx ≥ max(1, m ).

k

Array, size ( n ). On entry, k contains the permutation vector and is used as internal workspace.

Output Parameters

x: On exit, x contains the permuted matrix X .
k: On exit, k is reset to its original value.

NOTE:

?lapmr

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Developer Reference for Intel® oneAPI Math Kernel Library for C

?lapmt

Syntax

Include Files

Description

Input Parameters

Output Parameters