?laswp

Developer Reference for Intel® oneAPI Math Kernel Library for C

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ID 766684

Date 4/28/2026

Version

Public

?laswp

Performs a series of row interchanges on a general rectangular matrix.

Syntax

lapack_intLAPACKE_slaswp ( intmatrix_layout , lapack_intn , float*a , lapack_intlda , lapack_intk1 , lapack_intk2 , constlapack_int*ipiv , lapack_intincx );

lapack_intLAPACKE_dlaswp ( intmatrix_layout , lapack_intn , double*a , lapack_intlda , lapack_intk1 , lapack_intk2 , constlapack_int*ipiv , lapack_intincx );

lapack_intLAPACKE_claswp ( intmatrix_layout , lapack_intn , lapack_complex_float*a , lapack_intlda , lapack_intk1 , lapack_intk2 , constlapack_int*ipiv , lapack_intincx );

lapack_intLAPACKE_zlaswp ( intmatrix_layout , lapack_intn , lapack_complex_double*a , lapack_intlda , lapack_intk1 , lapack_intk2 , constlapack_int*ipiv , lapack_intincx );

Include Files

mkl.h

Description

slaswp dlaswp claswp zlaswp

The routine performs a series of row interchanges on the matrix A . One row interchange is initiated for each of rows k1 through k2 of A .

Input Parameters

A <datatype> placeholder, if present, is used for the C interface data types in the C interface section above. See C Interface Conventions for the C interface principal conventions and type definitions.

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

n

The number of columns of the matrix A .

a: REAL for slaswp DOUBLE PRECISION for dlaswp COMPLEX for claswp DOUBLE COMPLEX for zlaswp . Array, size lda by n . Array, size max(1, lda*n) for column major and max(1, lda*mm) for row major layout. Here mm is not less than maximum of values ipiv[k1-1+j*|incx|] , 0≤j<k2-k1 . Array a contains the m -by- n matrix A .

lda

The leading dimension of the array a .

k1

The first element of ipiv for which a row interchange will be done.

k2

The last element of ipiv for which a row interchange will be done.

ipiv

Array, size k1+(k2-k1)*|incx|) . The vector of pivot indices. Only the elements in positions k1 through k2 of ipiv are accessed. ipiv(k) = l implies rows k and l are to be interchanged.

incx

The increment between successive values of ipiv . If ipiv is negative, the pivots are applied in reverse order.

Output Parameters

a: On exit, the permuted matrix.

Return Values

This function returns a value info .

If info = 0 , the execution is successful.
If info = -i , the i -th parameter had an illegal value.
If info = -1011 , memory allocation error occurred.

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Developer Reference for Intel® oneAPI Math Kernel Library for C

?laswp

Syntax

Include Files

Description

Input Parameters

Output Parameters

Return Values