qmegas/php-rand-custom-distribution
Composer 安装命令：
composer require qmegas/php-rand-custom-distribution
包简介
Random number generator with custom distribution
README 文档
README
Standard PHP functions like rand or mt_rand generate random numbers with normal distribution, however sometimes it
required to generate random numbers with different distribution, for example binomial distribution.
Installation
composer require qmegas/php-rand-custom-distribution
Requirements
PHP >= 7.0
Simple Example
$generator = new \Qmegas\RandomGenerator(50, 150, function(float $i) { return $i * 100; }); echo $generator->getNumber();
Class constractor receives 3 arguments: low-high bounds of generated numbers and distribution function. Distribution function receives float argument between 0 and 1 and should return some integer value >= 0, see additional examples for better understanding.
Some Additional Examples
| Normal Distribution |
$generator = new \Qmegas\RandomGenerator($min, $max, function() { return 1; }); |
 |
$generator = new \Qmegas\RandomGenerator($min, $max, function(float $i) { return $i * 100; }); |
 |
$generator = new \Qmegas\RandomGenerator($min, $max, function(float $i) { return (1 - $i) * 100; }); |
 |
$generator = new \Qmegas\RandomGenerator($min, $max, function(float $i) { return (1 - $i) * 200 * $i; }); |
 |
$generator = new \Qmegas\RandomGenerator($min, $max, function(float $i) { return (2 * (1 - $i) * ($i ** 0.5) + ($i ** 2)) * 100; }); |
 |
$generator = new \Qmegas\RandomGenerator($min, $max, function(float $i) { return ($i ** 3) * 100; }); |
 |
$generator = new \Qmegas\RandomGenerator($min, $max, function(float $i) { return (3 * ((1 - $i) ** 2) * $i + ($i ** 3)) * 100; }); |
 |
$generator = new \Qmegas\RandomGenerator($min, $max, function(float $i) { return (1 / (1 + exp(-10 * ($i - 0.5)))) * 100; }); |
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其他信息
- 授权协议： MIT
- 更新时间： 2020-12-02