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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 | 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 2008x 2008x 3x 3x 2005x 2005x 2005x 2005x 2005x 2005x 2005x 2005x 2005x 2005x 2005x 2005x 2005x 2005x 2009x 1x 1x 2009x 2001x 2001x 7x 2009x 2008x 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 isNonNegativeInteger = require( '@stdlib/math/base/assert/is-nonnegative-integer' ); var isnan = require( '@stdlib/math/base/assert/is-nan' ); var expm1 = require( '@stdlib/math/base/special/expm1' ); var ln = require( '@stdlib/math/base/special/ln' ); var NINF = require( '@stdlib/constants/float64/ninf' ); // MAIN // /** * Returns a function for evaluating the logarithm of the probability mass function (PMF) for a Planck distribution with shape parameter `lambda`. * * @param {PositiveNumber} lambda - shape parameter * @returns {Function} logPMF * * @example * var logpmf = factory( 0.5 ); * var y = logpmf( 3.0 ); * // returns ~-2.4328 * * y = logpmf( 1.0 ); * // returns ~-1.4328 */ function factory( lambda ) { if ( isnan( lambda ) || lambda <= 0.0 ) { return constantFunction( NaN ); } return logpmf; /** * Evaluates the logarithm of the probability mass function (PMF) for a Planck distribution. * * @private * @param {number} x - input value * @returns {NonPositiveNumber} evaluated logPMF * * @example * var y = logpmf( 2.0 ); * // returns <number> */ function logpmf( x ) { if ( isnan( x ) ) { return NaN; } if ( isNonNegativeInteger( x ) ) { return ln( -expm1( -lambda ) ) - ( lambda * x ); } return NINF; } } // EXPORTS // module.exports = factory; |