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* @license Apache-2.0
*
* Copyright (c) 2018 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 constantFunction = require( '@stdlib/utils/constant-function' );
var isnan = require( '@stdlib/math/base/assert/is-nan' );
// MAIN //
/**
* Returns a function for evaluating the cumulative distribution function (CDF) of a degenerate distribution centered at a provided mean value.
*
* @param {number} mu - constant value of distribution
* @returns {Function} function to evaluate the cumulative distribution function
*
* @example
* var cdf = factory( 5.0 );
*
* var y = cdf( 3.0 );
* // returns 0.0
*
* y = cdf( 6.0 );
* // returns 1.0
*
* y = cdf( NaN );
* // returns NaN
*/
function factory( mu ) {
if ( isnan( mu ) ) {
return constantFunction( NaN );
}
return cdf;
/**
* Evaluates the cumulative distribution function (CDF) of a degenerate distribution.
*
* @private
* @param {number} x - input value
* @returns {Probability} evaluated cumulative distribution function
*
* @example
* var y = cdf( 10.0 );
* // returns <number>
*/
function cdf( x ) {
if ( isnan( x ) ) {
return NaN;
}
return (x < mu) ? 0.0 : 1.0;
}
}
// EXPORTS //
module.exports = factory;
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