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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 format = require( '@stdlib/string/format' );
var isOperationSide = require( '@stdlib/blas/base/assert/is-operation-side' );
var isColumnMajor = require( '@stdlib/ndarray/base/assert/is-column-major-string' );
var max = require( '@stdlib/math/base/special/fast/max' );
var base = require( './base.js' );
// FUNCTIONS //
/**
* Tests whether a string is a valid pivot type.
*
* @private
* @param {string} pivot - pivot type
* @returns {boolean} boolean indicating if the string is a valid pivot type
*/
function isPivot( pivot ) {
if ( pivot === 'variable' || pivot === 'top' || pivot === 'bottom' ) {
return true;
}
return false;
}
/**
* Tests whether a string is a valid direction.
*
* @private
* @param {string} direct - direction
* @returns {boolean} boolean indicating if the string is a valid direction
*/
function isDirection( direct ) {
if ( direct === 'forward' || direct === 'backward' ) {
return true;
}
return false;
}
// MAIN //
/**
* Applies a sequence of plane rotations to a general rectangular matrix.
*
* @param {string} order - storage layout
* @param {string} side - specifies the side where plane rotation matrix `P` is applied to `A`
* @param {string} pivot - specifies the plane for which `P(k)` is a plane rotation matrix
* @param {string} direct - specifies whether `P` is a forward or backward sequence of plane rotations
* @param {NonNegativeInteger} M - number of rows of `A`
* @param {NonNegativeInteger} N - number of columns of `A`
* @param {Float64Array} C - array of cosines of the plane rotations
* @param {Float64Array} S - array of sines of the plane rotations
* @param {Float64Array} A - input/output matrix
* @param {integer} LDA - stride of the first dimension of `A` (a.k.a., leading dimension of the matrix `A`)
* @throws {TypeError} first argument must be a valid order
* @throws {TypeError} second argument must be a valid side
* @throws {TypeError} third argument must be a valid pivot type
* @throws {TypeError} fourth argument must be a valid direction
* @throws {RangeError} fifth argument must be a non-negative integer
* @throws {RangeError} sixth argument must be a non-negative integer
* @throws {RangeError} tenth argument must be greater than or equal to max(1,`M`)
* @returns {Float64Array} `A`
*
* @example
* var Float64Array = require( '@stdlib/array/float64' );
*
* var C = new Float64Array( [ 0.8, 0.7, 0.9 ] );
* var S = new Float64Array( [ 0.6, -0.7142857142857143, 0.4358898943540673 ] );
* var A = new Float64Array( [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 ] );
*
* var out = dlasr( 'column-major', 'left', 'variable', 'forward', 4, 3, C, S, A, 4 );
* // returns <Float64Array>[ 2, ~-1.443, ~4.276, ~2.373, 7.6, ~-3.74, ~9.054, ~4.504, 13.2, ~-6.037, ~13.832, ~6.634 ]
*/
function dlasr( order, side, pivot, direct, M, N, C, S, A, LDA ) {
var sa1;
var sa2;
if ( !isLayout( order ) ) {
throw new TypeError( format( 'invalid argument. First argument must be a valid order. Value: `%s`.', order ) );
}
if ( !isOperationSide( side ) ) {
throw new TypeError( format( 'invalid argument. Second argument must be a valid operation side. Value: `%s`.', side ) );
}
if ( !isPivot( pivot ) ) {
throw new TypeError( format( 'invalid argument. Third argument must be a valid pivot. Value: `%s`.', pivot ) );
}
if ( !isDirection( direct ) ) {
throw new TypeError( format( 'invalid argument. Fourth argument must be a valid direction. Value: `%s`.', direct ) );
}
if ( M < 0 ) {
throw new RangeError( format( 'invalid argument. Fifth argument must be a nonnegative integer. Value: `%d`.', M ) );
}
if ( N < 0 ) {
throw new RangeError( format( 'invalid argument. Sixth argument must be a nonnegative integer. Value: `%d`.', N ) );
}
if ( ( isColumnMajor( order ) ) && LDA < max( 1, M ) ) {
throw new RangeError( format( 'invalid argument. Tenth argument must be greater than or equal to max(1,`M`). Value: `%d`.', LDA ) );
}
if ( order === 'column-major' ) {
sa1 = 1;
sa2 = LDA;
} else {
sa1 = LDA;
sa2 = 1;
}
return base( side, pivot, direct, M, N, C, 1, 0, S, 1, 0, A, sa1, sa2, 0 );
}
// EXPORTS //
module.exports = dlasr;
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