Press n or j to go to the next uncovered block, b, p or k for the previous block.
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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 cdf = require( '@stdlib/stats/base/dists/poisson/cdf' );
// VARIABLES //
var methods;
// FUNCTIONS //
/**
* Performs a search to the left.
*
* @private
* @param {NonNegativeInteger} x - starting guess
* @param {Probability} p - probability
* @param {NonNegativeNumber} lambda - mean parameter
* @returns {NonNegativeInteger} `p` quantile of the specified distribution
*/
function searchLeft( x, p, lambda ) {
var xp;
while ( true ) {
if ( x === 0 || cdf( x - 1.0, lambda ) < p ) {
return x;
}
xp = x - 1.0;
// Guard against non-advancing updates (e.g., when `x` is `NaN` or is so large that decrementing does not change its value) in order to avoid an infinite loop:
if ( !( xp < x ) ) {
return x;
}
x = xp;
}
}
/**
* Performs a search to the right.
*
* @private
* @param {NonNegativeInteger} x - starting guess
* @param {Probability} p - probability
* @param {NonNegativeNumber} lambda - mean parameter
* @returns {NonNegativeInteger} `p` quantile of the specified distribution
*/
function searchRight( x, p, lambda ) {
var xn;
while ( true ) {
xn = x + 1.0;
// Guard against non-advancing updates (e.g., when `x` is `NaN` or is so large that incrementing does not change its value) in order to avoid an infinite loop:
if ( !( xn > x ) ) {
return x;
}
x = xn;
if ( cdf( x, lambda ) >= p ) {
return x;
}
}
}
// MAIN //
methods = {
'left': searchLeft,
'right': searchRight
};
// EXPORTS //
module.exports = methods;
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