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* @license Apache-2.0
*
* Copyright (c) 2024 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 base = require( './base.js' );
// MAIN //
/**
* Performs a series of row interchanges on a matrix `A` using pivot indices stored in `IPIV`.
*
* @param {PositiveInteger} N - number of columns in `A`
* @param {Float64Array} A - input matrix
* @param {integer} strideA1 - stride of the first dimension of `A`
* @param {integer} strideA2 - stride of the second dimension of `A`
* @param {NonNegativeInteger} offsetA - index offset for `A`
* @param {NonNegativeInteger} k1 - index of first row to interchange
* @param {NonNegativeInteger} k2 - index of last row to interchange
* @param {integer} inck - direction in which to apply pivots (-1 to apply pivots in reverse order; otherwise, apply in provided order)
* @param {Int32Array} IPIV - vector of pivot indices
* @param {integer} strideIPIV - `IPIV` stride length
* @param {NonNegativeInteger} offsetIPIV - index offset for `IPIV`
* @returns {Float64Array} permuted matrix `A`
*
* @example
* var Int32Array = require( '@stdlib/array/int32' );
* var Float64Array = require( '@stdlib/array/float64' );
*
* var IPIV = new Int32Array( [ 2, 0, 1 ] );
* var A = new Float64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ] ); // => [ [ 1.0, 2.0 ], [ 3.0, 4.0 ], [ 5.0, 6.0 ] ]
*
* dlaswp( 2, A, 2, 1, 0, 0, 2, 1, IPIV, 1, 0 );
* // A => <Float64Array>[ 3.0, 4.0, 1.0, 2.0, 5.0, 6.0 ]
*/
function dlaswp( N, A, strideA1, strideA2, offsetA, k1, k2, inck, IPIV, strideIPIV, offsetIPIV ) { // eslint-disable-line max-len, max-params
var tmp;
if ( inck < 0 ) {
offsetIPIV += k2 * strideIPIV;
strideIPIV *= -1;
tmp = k1;
k1 = k2;
k2 = tmp;
inck = -1;
} else {
offsetIPIV += k1 * strideIPIV;
inck = 1;
}
return base( N, A, strideA1, strideA2, offsetA, k1, k2, inck, IPIV, strideIPIV, offsetIPIV ); // eslint-disable-line max-len
}
// EXPORTS //
module.exports = dlaswp;
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