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PHP | stats_rand_gen_ipoisson() Function

PHP stats_rand_gen_ipoisson() Function


Hello folks! welcome back to a new edition of our tutorial on PHP. In this tutorial guide, we are going to be discussing briefly about the stats_rand_gen_ipoisson() function.

The built-in PHP stats_rand_gen_ipoisson() function generates a single random deviate from the Poisson distribution.

Syntax

Following below is the syntax to use this function -

int stats_rand_gen_ipoisson( float $mu )


Parameter Details

Sr.NoParameterDescription
1

mu

The parameter of the Poisson distribution


Return Value

This PHP function returns a random deviate from the Poisson distribution, where mu is the parameter of the Poisson distribution.

Dependencies

This built-in function was first introduced in statistics extension (PHP version 4.0.0 and PEAR v1.4.0). In this tutorial guide, we used the latest release of stats-2.0.3 (PHP v7.0.0 or newer and PEAR version 1.4.0 or newer).

Example1

The example below computes the random deviation from the Poisson distribution with parameter 1 -

<?php
   var_dump(is_int(stats_rand_gen_ipoisson(1)));
?>

Output

When the above code is executed, it will produce the following result -

bool(true)

Example2

The example below computes the random deviation from the Poisson distribution with parameter 0 -

<?php
   var_dump(stats_rand_gen_ipoisson(0));
?>

Output

When the above code is executed, it will produce the following result -

int(0)

Example3

Following is an error case. In the following example below, we have passed mu < 0. A warning is shown in logs -

<?php
   // error cases
   var_dump(stats_rand_gen_ipoisson(-0.1));    // mu < 0
?>

Output

The above code will produce the following result and a warning in logs PHP Warning: stats_rand_gen_ipoisson(): mu < 0.0. mu : -1.000000E-1

bool(false)


Alright guys! This is where we are going to be rounding up for this tutorial post. In our next tutorial, we are going to be discussing about the built-in stats_rand_gen_iuniform() Function.

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