62 lines
1.8 KiB
JavaScript
62 lines
1.8 KiB
JavaScript
/**
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* @license Apache-2.0
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*
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* Copyright (c) 2020 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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// MODULES //
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var Float32Array = require( '@stdlib/array/float32' );
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var addon = require( './snanvarianceyc.native.js' );
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// MAIN //
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/**
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* Computes the variance of a single-precision floating-point strided array ignoring `NaN` values and using a one-pass algorithm proposed by Youngs and Cramer.
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*
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* @param {PositiveInteger} N - number of indexed elements
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* @param {number} correction - degrees of freedom adjustment
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* @param {Float32Array} x - input array
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* @param {integer} stride - stride length
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* @param {NonNegativeInteger} offset - starting index
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* @returns {number} variance
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*
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* @example
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* var Float32Array = require( '@stdlib/array/float32' );
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* var floor = require( '@stdlib/math/base/special/floor' );
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*
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* var x = new Float32Array( [ 2.0, 1.0, 2.0, -2.0, -2.0, 2.0, 3.0, 4.0, NaN, NaN ] );
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* var N = floor( x.length / 2 );
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*
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* var v = snanvarianceyc( N, 1, x, 2, 1 );
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* // returns 6.25
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*/
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function snanvarianceyc( N, correction, x, stride, offset ) {
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var view;
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if ( stride < 0 ) {
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offset += (N-1) * stride;
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}
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view = new Float32Array( x.buffer, x.byteOffset+(x.BYTES_PER_ELEMENT*offset), x.length-offset ); // eslint-disable-line max-len
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return addon( N, correction, view, stride );
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}
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// EXPORTS //
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module.exports = snanvarianceyc;
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