PHP | stats_rand_gen_chisquare() Function

PHP stats_rand_gen_chisquare() 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_chisquare() Function.

The built-in PHP stats_rand_gen_chisquare() function generates a random deviate from the chi-square distribution.

Syntax

Following below is the syntax to use this function -

float stats_rand_gen_chisquare( float $df )


Parameter Details

Sr.NoParameterDescription
1

df

The degrees of freedom


Return Value

It returns a random deviate from the chi-square distribution where the degrees of freedoms are df.

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 chi-square distribution -

<?php
   var_dump(is_float(stats_rand_gen_chisquare(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 have passed df< 0. A warning is shown in logs -

<?php
   // error cases
   var_dump(stats_rand_gen_chisquare(-0.1));   // df < 0
?>

Output

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

bool(false)

Example3

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

<?php
   // error cases
   var_dump(stats_rand_gen_chisquare(0));      // df == 0
?>

Output

The above code will produce the following result and a warning in logs PHP Warning: stats_rand_gen_chisquare(): df <= 0.0. df: 0.000000E+0

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_exponential() Function.

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