?lapmt

Developer Reference for Intel® oneAPI Math Kernel Library for C

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ID 766684

Date 12/16/2022

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?lapmt

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

Syntax

lapack_int LAPACKE_slapmt (int matrix_layout, lapack_logical forwrd, lapack_int m, lapack_int n, float * x, lapack_int ldx, lapack_int * k);

lapack_int LAPACKE_dlapmt (int matrix_layout, lapack_logical forwrd, lapack_int m, lapack_int n, double * x, lapack_int ldx, lapack_int * k);

lapack_int LAPACKE_clapmt (int matrix_layout, lapack_logical forwrd, lapack_int m, lapack_int n, lapack_complex_float * x, lapack_int ldx, lapack_int * k);

lapack_int LAPACKE_zlapmt (int matrix_layout, lapack_logical forwrd, lapack_int m, lapack_int n, lapack_complex_double * x, lapack_int ldx, 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[i - 1]for i = 1,...,n.

If forwrd≠ 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

If forwrd≠ 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

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.

Parent topic: LAPACK Auxiliary Routines

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