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 | 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 2007x 2007x 3x 3x 2004x 2004x 2004x 2004x 2004x 2004x 2004x 2004x 2004x 2004x 2004x 2004x 2004x 2004x 2006x 1x 1x 2006x 4x 4x 2006x 1x 1x 2000x 2006x 2007x 3x 3x 3x 3x 3x | /**
* @license Apache-2.0
*
* Copyright (c) 2025 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' );
var floor = require( '@stdlib/math/base/special/floor' );
var expm1 = require( '@stdlib/math/base/special/expm1' );
var ln = require( '@stdlib/math/base/special/ln' );
var NINF = require( '@stdlib/constants/float64/ninf' );
var PINF = require( '@stdlib/constants/float64/pinf' );
// MAIN //
/**
* Returns a function for evaluating the logarithm of the cumulative distribution function (CDF) for a Planck distribution with shape parameter `lambda`.
*
* @param {PositiveNumber} lambda - shape parameter
* @returns {Function} logCDF
*
* @example
* var logcdf = factory( 1.5 );
* var y = logcdf( 3.0 );
* // returns ~-0.0025
*
* y = logcdf( 1.0 );
* // returns ~-0.0511
*/
function factory( lambda ) {
if ( isnan( lambda ) || lambda <= 0.0 ) {
return constantFunction( NaN );
}
return logcdf;
/**
* Evaluates the logarithm of the cumulative distribution function (CDF) for a Planck distribution.
*
* @private
* @param {number} x - input value
* @returns {number} evaluated logCDF
*
* @example
* var y = logcdf( 2.0 );
* // returns <number>
*/
function logcdf( x ) {
if ( isnan( x ) ) {
return NaN;
}
if ( x < 0.0 ) {
return NINF;
}
if ( x === PINF ) {
return 0.0;
}
return ln( -expm1( -lambda * ( floor(x)+1.0 ) ) );
}
}
// EXPORTS //
module.exports = factory;
|