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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';
var isnan = require( '@stdlib/math/base/assert/is-nan' );
// MAIN //
/**
* Computes the residual sum of squares of two double-precision floating-point strided arrays, ignoring `NaN` values and using ordinary recursive summation.
*
* @param {PositiveInteger} N - number of indexed elements
* @param {Float64Array} x - first input array
* @param {integer} strideX - stride length of `x`
* @param {NonNegativeInteger} offsetX - starting index of `x`
* @param {Float64Array} y - second input array
* @param {integer} strideY - stride length of `y`
* @param {NonNegativeInteger} offsetY - starting index of `y`
* @returns {number} residual sum of squares
*
* @example
* var Float64Array = require( '@stdlib/array/float64' );
*
* var x = new Float64Array( [ 1.0, 2.0, 2.0, -7.0, -2.0, 3.0, 4.0, 2.0 ] );
* var y = new Float64Array( [ 2.0, 1.0, 2.0, 1.0, -2.0, 2.0, 3.0, 4.0 ] );
*
* var z = drssors( x.length, x, 1, 0, y, 1, 0 );
* // returns 72.0
*/
function drssors( N, x, strideX, offsetX, y, strideY, offsetY ) {
var sum;
var ix;
var iy;
var r;
var i;
if ( N <= 0 ) {
return 0.0;
}
ix = offsetX;
iy = offsetY;
if ( strideX === 0 && strideY === 0 ) {
if ( isnan( x[ ix ] ) || isnan( y[ iy ] ) ) {
return 0.0;
}
r = x[ ix ] - y[ iy ];
return N * r * r;
}
// Find the first non-NaN element pair...
for ( i = 0; i < N; i++ ) {
if ( isnan( x[ ix ] ) === false && isnan( y[ iy ] ) === false ) {
break;
}
ix += strideX;
iy += strideY;
}
if ( i === N ) {
return 0.0;
}
r = x[ ix ] - y[ iy ];
sum = r * r;
ix += strideX;
iy += strideY;
for ( i = 1; i < N; i++ ) {
if ( isnan( x[ ix ] ) === false && isnan( y[ iy ] ) === false ) {
r = x[ ix ] - y[ iy ];
sum += r * r;
}
ix += strideX;
iy += strideY;
}
return sum;
}
// EXPORTS //
module.exports = drssors;
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