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* @license Apache-2.0
*
* Copyright (c) 2026 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 isColumnMajor = require( '@stdlib/ndarray/base/assert/is-column-major-string' );
var stride2offset = require( '@stdlib/strided/base/stride2offset' );
var max = require( '@stdlib/math/base/special/fast/max' );
var format = require( '@stdlib/string/format' );
var ndarray = require( './ndarray.js' );
// MAIN //
/**
* Permutes the rows of a matrix according to the specified strided permutation array.
*
* @param {string} order - storage layout
* @param {NonNegativeInteger} M - number of rows in matrix `A`
* @param {NonNegativeInteger} N - number of columns in matrix `A`
* @param {Collection} A - input matrix
* @param {PositiveInteger} LDA - stride length for the first dimension of `A` (a.k.a., leading dimension of the matrix `A`)
* @param {Collection} ip - permutation index array
* @param {integer} strideIp - stride length for `ip`
* @param {Collection} workspace - workspace array for storing a row during permutation
* @param {integer} strideW - stride length for `workspace`
* @throws {TypeError} first argument must be a valid order
* @throws {RangeError} fifth argument must be a valid stride
* @returns {Collection} `A`
*
* @example
* var A = [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ];
* var ip = [ 2, 0, 1 ];
* var workspace = [ 0.0, 0.0 ];
*
* gpermuteRows( 'row-major', 3, 2, A, 2, ip, 1, workspace, 1 );
* // A => [ 5.0, 6.0, 1.0, 2.0, 3.0, 4.0 ]
*/
function gpermuteRows( order, M, N, A, LDA, ip, strideIp, workspace, strideW ) {
var sa1;
var sa2;
var s;
if ( !isLayout( order ) ) {
throw new TypeError( format( 'invalid argument. First argument must be a valid order. Value: `%s`.', order ) );
}
if ( isColumnMajor( order ) ) {
s = M;
sa1 = 1;
sa2 = LDA;
} else { // order === 'row-major'
s = N;
sa1 = LDA;
sa2 = 1;
}
if ( LDA < max( 1, s ) ) {
throw new RangeError( format( 'invalid argument. Fifth argument must be greater than or equal to max(1,%d). Value: `%d`.', s, LDA ) );
}
return ndarray( M, N, A, sa1, sa2, 0, ip, strideIp, stride2offset( M, strideIp ), workspace, strideW, stride2offset( N, strideW ) ); // eslint-disable-line max-len
}
// EXPORTS //
module.exports = gpermuteRows;
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