PHP | stats_rand_gen_exponential() Function

Hello folks! welcome back to a new edition of our tutorial on PHP. In this tutorial guide, we are going to be studying about the PHP stats_rand_gen_exponential() Function.

The stats_rand_gen_exponential() function is used to generate a random deviate from the exponential distribution.

Syntax

Following below is the syntax to use this function -

float stats_rand_gen_exponential( float $av )

READ: PHP | stats_rand_gen_chisquare() Function

Parameter Details

Sr.No	Parameter	Description
1	av	The scale parameter

Return Value

This PHP function returns a random deviate from the exponential distribution, where the scale parameter is av.

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

Following example computes the random deviation from the exponential distribution -

<?php
   var_dump(is_float(stats_rand_gen_exponential(2)));
?>

Output

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

bool(true)

Example2

In below example, we compute the random deviation from the exponential distribution by passing 0 as scale parameter -

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

Output

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

float(0)

Example3

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

<?php
   // error cases
   var_dump(stats_rand_gen_exponential(-0.1)); // av < 0
?>

Output

The above code will produce the following result and a warning in logs PHP Warning: stats_rand_gen_exponential(): av < 0.0

bool(false)

READ: PHP | stats_rand_gen_beta() Function

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 PHP stats_rand_gen_f() Function.

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