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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 kernelBetainc = require( '@stdlib/math/base/special/kernel-betainc' ).assign;
// MAIN //
/**
* Evaluates the incomplete beta function.
*
* @param {Probability} x - function parameter
* @param {NonNegativeNumber} a - function parameter
* @param {NonNegativeNumber} b - function parameter
* @param {boolean} [regularized=true] - boolean indicating if the function should evaluate the regularized or non-regularized incomplete beta function
* @param {boolean} [upper=false] - boolean indicating if the function should return the upper tail of the incomplete beta function
* @returns {number} function value
*
* @example
* var y = betainc( 0.5, 2.0, 2.0 );
* // returns 0.5
*
* @example
* var y = betainc( 0.5, 2.0, 2.0, false );
* // returns ~0.083
*
* @example
* var y = betainc( 0.2, 1.0, 2.0 );
* // returns 0.36
*/
function betainc( x, a, b, regularized, upper ) {
var out = [ 0.0, 0.0 ];
regularized = ( regularized === false ) ? false : true; // eslint-disable-line no-unneeded-ternary
upper = ( upper === true ) ? true : false; // eslint-disable-line no-unneeded-ternary
kernelBetainc( x, a, b, regularized, upper, out, 1, 0 );
return out[ 0 ];
}
// EXPORTS //
module.exports = betainc;
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