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* @license Apache-2.0
*
* Copyright (c) 2025 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
// MODULES //
var isLayout = require( '@stdlib/blas/base/assert/is-layout' );
var isRowMajor = require( '@stdlib/ndarray/base/assert/is-row-major-string' );
var isColumnMajor = require( '@stdlib/ndarray/base/assert/is-column-major-string' );
var max = require( '@stdlib/math/base/special/max' );
var format = require( '@stdlib/string/format' );
var base = require( './base.js' );
// MAIN //
/**
* Performs a series of row interchanges on a matrix `A` using pivot indices stored in `IPIV`.
*
* @param {string} order - storage layout
* @param {PositiveInteger} N - number of columns in `A`
* @param {Complex64Array} A - input matrix
* @param {PositiveInteger} LDA - stride of the first dimension of `A` (a.k.a., leading dimension of the matrix `A`)
* @param {NonNegativeInteger} k1 - index of first row to interchange
* @param {NonNegativeInteger} k2 - index of last row to interchange
* @param {Int32Array} IPIV - vector of pivot indices
* @param {integer} incx - increment between successive values of `IPIV`
* @throws {TypeError} first argument must be a valid order
* @throws {RangeError} fourth argument must be greater than or equal to max(1,N)
* @returns {Complex64Array} permuted matrix `A`
*
* @example
* var Int32Array = require( '@stdlib/array/int32' );
* var Complex64Array = require( '@stdlib/array/complex64' );
*
* var IPIV = new Int32Array( [ 2, 0, 1 ] );
* var A = new Complex64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0, 11.0, 12.0 ] );
*
* claswp( 'row-major', 2, A, 2, 0, 2, IPIV, 1 );
* // A => <Complex64Array>[ 5.0, 6.0, 7.0, 8.0, 1.0, 2.0, 3.0, 4.0, 9.0, 10.0, 11.0, 12.0 ]
*/
function claswp( order, N, A, LDA, k1, k2, IPIV, incx ) {
var tmp;
var inc;
var sa1;
var sa2;
var io;
if ( !isLayout( order ) ) {
throw new TypeError( format( 'invalid argument. First argument must be a valid order. Value: `%s`.', order ) );
}
if ( isRowMajor( order ) && LDA < max( 1, N ) ) {
throw new RangeError( format( 'invalid argument. Fourth argument must be greater than or equal to max(1,%d). Value: `%d`.', N, LDA ) );
}
if ( incx > 0 ) {
inc = 1;
io = k1;
} else if ( incx < 0 ) {
inc = -1;
io = k1 + ( (k1-k2) * incx );
tmp = k1;
k1 = k2;
k2 = tmp;
} else {
return A;
}
if ( isColumnMajor( order ) ) {
sa1 = 1;
sa2 = LDA;
} else { // order === 'row-major'
sa1 = LDA;
sa2 = 1;
}
return base( N, A, sa1, sa2, 0, k1, k2, inc, IPIV, incx, io );
}
// EXPORTS //
module.exports = claswp;
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