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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.
*/
/* eslint-disable max-len, max-params */
'use strict';
// MODULES //
var format = require( '@stdlib/string/format' );
var isOperationSide = require( '@stdlib/blas/base/assert/is-operation-side' );
var isMatrixTranspose = require( '@stdlib/blas/base/assert/is-transpose-operation' );
var base = require( './base.js' );
// MAIN //
/**
* Multiply a general matrix by the orthogonal matrix from a LQ factorization determined by `DGELQF` using alternative indexing semantics.
*
* ## Notes
*
* - `Q` is a real orthogonal matrix defined as the product of k elementary reflectors, Q = H(k) . . . H(2) H(1) as returned by `DGELQF`.
*
* - `Q` is of order `M` if SIDE = 'left' and of order `N` if SIDE = 'R'.
*
* - `DORML2` overwrites the general real `M` by `N` matrix `C` with,
*
* - `Q * C` if SIDE = 'left' and TRANS = 'no-transpose', or
* - `Q^T* C` if SIDE = 'left' and TRANS = 'transpose', or
* - `C * Q` if SIDE = 'right' and TRANS = 'no-transpose', or
* - `C * Q**T` if SIDE = 'right' and TRANS = 'transpose'.
*
* @param {string} side - specifies the side of multiplication with `C`
* @param {string} trans - `'no-transpose'` for `Q`, `'transpose'` for `Q^T`
* @param {NonNegativeInteger} M - number of rows of `C`
* @param {NonNegativeInteger} N - number of columns of `C`
* @param {NonNegativeInteger} K - number of elementary reflectors
* @param {Float64Array} A - reflector vectors from `DGELQ2`
* @param {integer} strideA1 - stride of the first dimension of A
* @param {integer} strideA2 - stride of the second dimension of A
* @param {NonNegativeInteger} offsetA - starting index for A
* @param {Float64Array} TAU - scalar factors of reflectors
* @param {integer} strideTAU - stride for TAU
* @param {NonNegativeInteger} offsetTAU - starting index for TAU
* @param {Float64Array} C - input/output matrix
* @param {integer} strideC1 - stride of the first dimension of `C`
* @param {integer} strideC2 - stride of the second dimension of `C`
* @param {NonNegativeInteger} offsetC - starting index for `C`
* @param {Float64Array} WORK - workspace array
* @param {integer} strideWORK - stride for `WORK`
* @param {NonNegativeInteger} offsetWORK - starting index for `WORK`
* @throws {TypeError} first argument must be a valid side
* @throws {TypeError} second argument must be a valid transpose operation
* @throws {RangeError} third argument must be a non-negative integer
* @throws {RangeError} fourth argument must be a non-negative integer
* @throws {RangeError} fifth argument must be a non-negative integer
* @throws {RangeError} fifth argument must be smaller than the order of `Q`
* @throws {RangeError} fifth argument must be smaller than the order of `Q`
* @returns {integer} status code (0 if successful)
*
* @example
* var Float64Array = require( '@stdlib/array/float64' );
*
* var A = new Float64Array( [ 1, 0 ] );
* var TAU = new Float64Array( [ 2 ] );
* var C = new Float64Array( [ 1, 3, 5, 2, 4, 6 ] );
* var WORK = new Float64Array( 3 );
*
* var info = dorml2( 'left', 'no-transpose', 2, 3, 1, A, 2, 1, 0, TAU, 1, 0, C, 3, 1, 0, WORK, 1, 0 );
* // returns 0
* // C => <Float64Array>[ -1, -3, -5, 2, 4, 6 ]
* // WORK => <Float64Array>[ 1, 3, 5 ]
*/
function dorml2( side, trans, M, N, K, A, strideA1, strideA2, offsetA, TAU, strideTAU, offsetTAU, C, strideC1, strideC2, offsetC, WORK, strideWORK, offsetWORK ) {
if ( !isOperationSide( side ) ) {
throw new TypeError( format( 'invalid argument. First argument must be a valid operation side. Value: `%s`.', side ) );
}
if ( !isMatrixTranspose( trans ) ) {
throw new TypeError( format( 'invalid argument. Second argument must be a valid transpose operation. Value: `%s`.', trans ) );
}
if ( M < 0 ) {
throw new RangeError( format( 'invalid argument. Third argument must be a nonnegative integer. Value: `%d`.', M ) );
}
if ( N < 0 ) {
throw new RangeError( format( 'invalid argument. Fourth argument must be a nonnegative integer. Value: `%d`.', N ) );
}
if ( K < 0 ) {
throw new RangeError( format( 'invalid argument. Fifth argument must be a nonnegative integer. Value: `%d`.', K ) );
}
if ( side === 'left' && K > M ) {
throw new RangeError( format( 'invalid argument. Fifth argument must be smaller than the order of `Q`. Value: `%d`.', K ) );
}
if ( side === 'right' && K > N ) {
throw new RangeError( format( 'invalid argument. Fifth argument must be smaller than the order of `Q`. Value: `%d`.', K ) );
}
return base( side, trans, M, N, K, A, strideA1, strideA2, offsetA, TAU, strideTAU, offsetTAU, C, strideC1, strideC2, offsetC, WORK, strideWORK, offsetWORK );
}
// EXPORTS //
module.exports = dorml2;
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