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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';
// MODULES //
var ddot = require( '@stdlib/blas/base/ddot' ).ndarray;
var dnrm2 = require( '@stdlib/blas/base/dnrm2' ).ndarray;
// MAIN //
/**
* Computes the cosine similarity of two double-precision floating-point strided arrays using alternative indexing semantics.
*
* @param {NonNegativeInteger} N - number of indexed elements
* @param {Float64Array} x - first input array
* @param {integer} strideX - stride length of `x`
* @param {NonNegativeInteger} offsetX - starting index for `x`
* @param {Float64Array} y - second input array
* @param {integer} strideY - stride length of `x`
* @param {NonNegativeInteger} offsetY - starting index for `y`
* @returns {number} cosine similarity
*
* @example
* var Float64Array = require( '@stdlib/array/float64' );
*
* var x = new Float64Array( [ 4.0, 2.0, -3.0, 5.0, -1.0 ] );
* var y = new Float64Array( [ 2.0, 6.0, -1.0, -4.0, 8.0 ] );
*
* var z = dcosineSimilarity( x.length, x, 1, 0, y, 1, 0 );
* // returns ~-0.061
*/
function dcosineSimilarity( N, x, strideX, offsetX, y, strideY, offsetY ) {
var ynrm;
var xnrm;
var dot;
if ( N <= 0 ) {
return 0.0;
}
dot = ddot( N, x, strideX, offsetX, y, strideY, offsetY );
xnrm = dnrm2( N, x, strideX, offsetX );
ynrm = dnrm2( N, y, strideY, offsetY );
return dot / ( xnrm * ynrm );
}
// EXPORTS //
module.exports = dcosineSimilarity;
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