66 lines
1.8 KiB
JavaScript
66 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 dmeanvarpn = require( './../../../base/dmeanvarpn' );
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var sqrt = require( '@stdlib/math/base/special/sqrt' );
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// MAIN //
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/**
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* Computes the mean and standard deviation of a double-precision floating-point strided array using a two-pass algorithm.
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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 {Float64Array} x - input array
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* @param {integer} strideX - `x` stride length
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* @param {Float64Array} out - output array
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* @param {integer} strideOut - `out` stride length
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* @returns {Float64Array} output array
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*
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* @example
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* var Float64Array = require( '@stdlib/array/float64' );
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*
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* var x = new Float64Array( [ 1.0, -2.0, 2.0 ] );
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* var out = new Float64Array( 2 );
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*
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* var v = dmeanstdevpn( x.length, 1, x, 1, out, 1 );
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* // returns <Float64Array>[ ~0.3333, ~2.0817 ]
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*/
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function dmeanstdevpn( N, correction, x, strideX, out, strideOut ) {
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var io;
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dmeanvarpn( N, correction, x, strideX, out, strideOut );
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if ( strideOut < 0 ) {
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io = 0;
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} else {
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io = strideOut;
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}
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out[ io ] = sqrt( out[ io ] );
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return out;
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}
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// EXPORTS //
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module.exports = dmeanstdevpn;
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