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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';
/**
* LAPACK routine to multiply a matrix by an orthogonal matrix from a QR factorization.
*
* ## Notes
*
* `dorm2r` overwrites the general real M by N matrix C with
*
* - `Q * C` if side = 'left' and trans = 'no-transpose'
* - `Q^T * C` if side = 'left' and trans = 'transpose'
* - `C * Q` if side = 'right' and trans = 'no-transpose'
* - `C * Q^T` if side = 'right' and trans = 'transpose'
*
* where Q is a real orthogonal matrix defined as the product of K elementary reflectors `Q = H(1) H(2) ... H(K)` as returned by `dgeqrf`. Q is of order M if side = 'left' and of order N if side = 'right'.
*
* @module @stdlib/lapack/base/dorm2r
*
* @example
* var Float64Array = require( '@stdlib/array/float64' );
* var dorm2r = require( '@stdlib/lapack/base/dorm2r' );
*
* var A = new Float64Array( [ 1.0, 0.0, 0.0, 2.0, 4.0, 0.0, 3.0, 5.0, 6.0 ] );
* var tau = new Float64Array( [ 7.0, 8.0, 9.0 ] );
* var C = new Float64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0 ] );
* var work = new Float64Array( 3 );
*
* dorm2r( 'row-major', 'left', 'no-transpose', 3, 3, 3, A, 3, tau, C, 3, work );
* // C => <Float64Array>[ -261638.0, -298618.0, -335598.0, -521066.0, -594715.0, -668364.0, -773933.0, -883324.0, -992715.0 ]
*/
// MODULES //
var join = require( 'path' ).join;
var tryRequire = require( '@stdlib/utils/try-require' );
var isError = require( '@stdlib/assert/is-error' );
var main = require( './main.js' );
// MAIN //
var dorm2r;
var tmp = tryRequire( join( __dirname, './native.js' ) );
if ( isError( tmp ) ) {
dorm2r = main;
} else {
dorm2r = tmp;
}
// EXPORTS //
module.exports = dorm2r;
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