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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.
*/
/* eslint-disable max-len,max-params */
'use strict';
// MAIN //
/**
* Applies a vector of real plane rotations to elements of real vectors `X` and `Y` using alternative indexing semantics.
*
* @param {NonNegativeInteger} N - number of plane rotations to apply
* @param {Float64Array} X - first input vector
* @param {integer} strideX - `X` stride length
* @param {NonNegativeInteger} offsetX - starting index of `X`
* @param {Float64Array} Y - second input vector
* @param {integer} strideY - `Y` stride length
* @param {NonNegativeInteger} offsetY - starting index of `Y`
* @param {Float64Array} C - vector of cosines of plane rotations
* @param {integer} strideC - `C` stride length
* @param {NonNegativeInteger} offsetC - starting index of `C`
* @param {Float64Array} S - vector of sines of plane rotations
* @param {integer} strideS - `S` stride length
* @param {NonNegativeInteger} offsetS - starting index of `S`
* @returns {Float64Array} `Y`
*
* @example
* var Float64Array = require( '@stdlib/array/float64' );
*
* var X = new Float64Array( [ 1.0, 1.0 ] );
* var Y = new Float64Array( [ 1.0, 1.0 ] );
* var C = new Float64Array( [ 1.0, 1.0 ] );
* var S = new Float64Array( [ 0.0, 0.0 ] );
*
* dlartv( 2, X, 1, 0, Y, 1, 0, C, 1, 0, S, 1, 0 );
* // X => <Float64Array>[ 1.0, 1.0 ]
* // Y => <Float64Array>[ 1.0, 1.0 ]
*/
function dlartv( N, X, strideX, offsetX, Y, strideY, offsetY, C, strideC, offsetC, S, strideS, offsetS ) {
var ic;
var is;
var ix;
var iy;
var xi;
var yi;
var i;
ic = offsetC;
is = offsetS;
ix = offsetX;
iy = offsetY;
for ( i = 0; i < N; i++ ) {
xi = X[ ix ];
yi = Y[ iy ];
X[ ix ] = ( C[ ic ] * xi ) + ( S[ is ] * yi );
Y[ iy ] = ( C[ ic ] * yi ) - ( S[ is ] * xi );
ix += strideX;
iy += strideY;
ic += strideC;
is += strideS;
}
return Y;
}
// EXPORTS //
module.exports = dlartv;
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