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* @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 addon = require( './../src/addon.node' );
// MAIN //
/**
* Evaluates the probability mass function (PMF) for a Planck (discrete exponential) distribution with shape parameter `lambda` .
*
* @private
* @param {number} x - input value (integer)
* @param {number} lambda - shape parameter
* @returns {Probability} evaluated PMF
*
* @example
* var y = pmf( 4.0, 0.3 );
* // returns ~0.0781
*
* @example
* var y = pmf( 2.0, 1.7 );
* // returns ~0.0273
*
* @example
* var y = pmf( -1.0, 2.5 );
* // returns 0.0
*
* @example
* var y = pmf( NaN, 0.0 );
* // returns NaN
*
* @example
* var y = pmf( 0.0, NaN );
* // returns NaN
*
* @example
* var y = pmf( 2.0, -1.0 );
* // returns NaN
*/
function pmf( x, lambda ) {
return addon( x, lambda );
}
// EXPORTS //
module.exports = pmf;
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