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PHP - Stats Rand Gen Normal() Function
Definition and Usage
The stats_rand_gen_normal() function can generate a single random deviate from a normal distribution.
Syntax
float stats_rand_gen_normal( float $av, float $sd )
Parameters
Sr.No | Parameter | Description |
---|---|---|
1 | av |
php_stats_rand_gen_normal_function |
2 | sd |
The standard deviation of the normal distribution |
Return Values
The stats_rand_gen_normal() function can return a random deviate from the normal distribution with mean, av, and standard deviation, sd.
Dependencies
This function was first introduced in statistics extension (PHP 4.0.0 and PEAR 1.4.0). We have used latest release of stats-2.0.3 (PHP 7.0.0 or newer and PEAR 1.4.0 or newer) for this tutorial
Example
In the following example, we generate a random deviate from the normal distribution with mean, 0, and standard deviation, 1.
<?php var_dump(is_float(stats_rand_gen_normal(0, 1))); ?>
Output
This will produce following result −
bool(true)
Example
In the following example, we generate a random deviate from the normal distribution with mean, 0, and standard deviation, 0.
<?php var_dump(stats_rand_gen_normal(0, 0)); ?>
Output
This will produce following result −
float(0)
Example
Following is an error case. In the following example, we pass sd < 0. A warning is displayed in logs.
<?php // error cases var_dump(stats_rand_gen_normal(0, -0.1)); // sd < 0 ?>
Output
This will produce following result and a warning in logs PHP Warning: stats_rand_gen_normal(): sd < 0.0 . sd : -1.000000E-1
bool(false)