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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 max = require( '@stdlib/math/base/special/max' );
var format = require( '@stdlib/string/format' );
var base = require( './base.js' );
// MAIN //
/**
* Rearranges the rows of an `M` by `N` matrix `X` as specified by a permutation vector `K`.
*
* @param {string} order - storage layout
* @param {boolean} forwrd - boolean indicating whether to apply a forward permutation
* @param {NonNegativeInteger} M - number of rows of `X`
* @param {NonNegativeInteger} N - number of columns of `X`
* @param {Float64Array} X - input matrix
* @param {PositiveInteger} LDX - leading dimension of `X`
* @param {Int32Array} K - permutation vector
* @param {integer} strideK - stride length of `K`
* @throws {TypeError} first argument must be a valid order
* @throws {RangeError} sixth argument must be greater than or equal to max(1,N)
* @throws {RangeError} eighth argument must be a non-zero integer
* @returns {Float64Array} permuted matrix `X`
*
* @example
* var Int32Array = require( '@stdlib/array/int32' );
* var Float64Array = require( '@stdlib/array/float64' );
*
* var X = 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 ] ]
* var K = new Int32Array( [ 2, 0, 1 ] );
*
* dlapmr( 'row-major', true, 3, 2, X, 2, K, 1 );
* // X => <Float64Array>[ 5.0, 6.0, 1.0, 2.0, 3.0, 4.0 ]
*/
function dlapmr( order, forwrd, M, N, X, LDX, K, strideK ) {
var sx1;
var sx2;
if ( !isLayout( order ) ) {
throw new TypeError( format( 'invalid argument. First argument must be a valid order. Value: `%s`.', order ) );
}
if ( isColumnMajor( order ) ) {
sx1 = 1;
sx2 = LDX;
} else { // order === 'row-major'
if ( LDX < max( 1, N ) ) {
throw new RangeError( format( 'invalid argument. Sixth argument must be greater than or equal to max(1,%d). Value: `%d`.', N, LDX ) );
}
sx1 = LDX;
sx2 = 1;
}
if ( strideK === 0 ) {
throw new RangeError( format( 'invalid argument. Eighth argument must be a non-zero integer. Value: `%d`.', strideK ) );
}
return base( forwrd, M, N, X, sx1, sx2, 0, K, strideK, 0 );
}
// EXPORTS //
module.exports = dlapmr;
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