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.
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.No | Parameter | Description |
---|---|---|
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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Feel free to ask your questions where necessary and we will attend to them as soon as possible. If this tutorial was helpful to you, you can use the share button to share this tutorial.
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Thanks for reading and bye for now.