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* @license Apache-2.0
*
* Copyright (c) 2026 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 degenerate = require( '@stdlib/stats/base/dists/degenerate/quantile' ).factory;
var isnan = require( '@stdlib/math/base/assert/is-nan' );
var bisect = require( './bisect.js' );
// MAIN //
/**
* Returns a function for evaluating the quantile function for a Wald distribution.
*
* @param {PositiveNumber} mu - mean
* @param {NonNegativeNumber} lambda - shape parameter
* @returns {Function} quantile function
*
* @example
* var quantile = factory( 1.0, 1.0 );
* var y = quantile( 0.8 );
* // returns ~1.448
*
* y = quantile( 0.5 );
* // returns ~0.676
*/
function factory( mu, lambda ) {
if ( isnan( mu ) || isnan( lambda ) || mu <= 0.0 || lambda < 0.0 ) {
return constantFunction( NaN );
}
if ( lambda === 0.0 ) {
return degenerate( mu );
}
return quantile;
/**
* Evaluates the quantile function for a Wald distribution.
*
* @private
* @param {Probability} p - input value
* @returns {NonNegativeNumber} evaluated quantile function
*
* @example
* var y = quantile( 0.3 );
* // returns <number>
*/
function quantile( p ) {
if ( isnan( p ) || p < 0.0 || p > 1.0 ) {
return NaN;
}
return bisect( p, mu, lambda );
}
}
// EXPORTS //
module.exports = factory;
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