PHP | stats_rand_gen_beta() Function

PHP stats_rand_gen_beta() 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_beta() Function.

The built-in stats_rand_gen_beta() function generates a random deviate from the beta distribution.

Syntax

Following below is the syntax to use this function -

float stats_rand_gen_beta( float $a, float $b )


Parameter Details

Sr.NoParameterDescription
1

a

The shape parameter of the beta distribution.

2

b

The shape parameter of the beta distribution.


Return Value

It returns a random deviate from the beta distribution with parameters A and B. The density of the beta is x ^(a-1) * (1-x) ^ (b-1) / B(a,b) for 0<x<. Method R. C. H. Cheng.

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 beta distribution.

<?php
   var_dump(is_float(stats_rand_gen_beta(2, 3)));
?>

Output

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

bool(true)

Example2

The following is an error case, in the below example, we passed a < 1e-37. A warning is shown in logs.

<?php
   // error cases
   var_dump(stats_rand_gen_beta(1e-38, 1));    // a < 1e-37
?>

Output

The above code will produce the following result and a warning in logs PHP Warning: stats_rand_gen_beta(): 'a' or 'b' lower than 1.0E-37. 'a' value: 1.000000E-38 'b' value: 1.000000E+0

bool(false)

Example3

The following below is an error case. In the below example, we have passed b < 1e-37. A warning is shown in logs -

<?php
   // error cases
   var_dump(stats_rand_gen_beta(1, 1e-38));    // b < 1e-37
?>

Output

The above code will produce the following result and a warning in logs PHP Warning: stats_rand_gen_beta(): 'a' or 'b' lower than 1.0E-37. 'a' value: 1.000000E+0 'b' value: 1.000000E-38

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 PHP stats_rand_gen_chisquare() Function.

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