Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 | 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3013x 3013x 3013x 3013x 3013x 3013x 3013x 3007x 3013x 10x 10x 3003x 3003x 3003x 3003x 3003x 3003x 3003x 3003x 3003x 3003x 3003x 3003x 3003x 3003x 3003x 3006x 1x 1x 3005x 3006x 3013x 3x 3x 3x 3x 3x | /**
* @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 ldfrechet = require( '@stdlib/stats/base/dists/frechet/logpdf' ).factory;
var isnan = require( '@stdlib/math/base/assert/is-nan' );
var exp = require( '@stdlib/math/base/special/exp' );
// MAIN //
/**
* Returns a function for evaluating the probability density function (PDF) for a Fréchet distribution with shape `alpha`, scale `s`, and location `m`.
*
* @param {PositiveNumber} alpha - shape parameter
* @param {PositiveNumber} s - scale parameter
* @param {number} m - location parameter
* @returns {Function} PDF
*
* @example
* var pdf = factory( 3.0, 3.0, 5.0 );
*
* var y = pdf( 10.0 );
* // returns ~0.104
*
* y = pdf( 7.0 );
* // returns ~0.173
*/
function factory( alpha, s, m ) {
var logpdf;
if (
isnan( alpha ) ||
isnan( s ) ||
isnan( m ) ||
alpha <= 0.0 ||
s <= 0.0
) {
return constantFunction( NaN );
}
logpdf = ldfrechet( alpha, s, m );
return pdf;
/**
* Evaluates the probability density function (PDF) for a Fréchet distribution.
*
* @private
* @param {number} x - input value
* @returns {number} evaluated PDF
*
* @example
* var y = pdf( -2.0 );
* // returns <number>
*/
function pdf( x ) {
if ( isnan( x ) ) {
return NaN;
}
return exp( logpdf( x, alpha, s, m ) );
}
}
// EXPORTS //
module.exports = factory;
|