PHP | stats_stat_powersum() Function

PHP stats_stat_powersum() 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_stat_powersum() function.

The stats_stat_powersum() function is used to return the power sum of a vector.

Syntax

Following below is the syntax to use this function -

float stats_stat_powersum( array $arr, float $power )


Parameter Details

Sr.NoParameterDescription
1

arr

The input array

2

power

The power


Return Value

This function returns the sum of power-th power of a vector represented as an array arr.

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

In the below example, we compute the sum of 2-th power of a vector represented as an array array(1, 2, 4) -

<?php
   var_dump(stats_stat_powersum(array(1, 2, 4), 2));
?>

Output

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

float(21)

Example2

In the below example, we compute the sum of 0-th power of a vector represented as an array array(1, 2, 4) -

<?php
   var_dump(stats_stat_powersum(array(1, 2, 4), 0));
?>

Output

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

float(3)

Example3

In the below example, we compute the sum of -2-th power of a vector represented as an array array(1, 2, 4) -

<?php
   var_dump(stats_stat_powersum(array(1, 2, 4), -2));
?>

Output

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

float(1.3125)

Example4

The following is an error case. In the below example, we passed empty array. A warning is shown in logs -

<?php
   // error cases
   var_dump(stats_stat_powersum(array(), 1));
?>

Output

The above code will produce the following result and a warning in logs PHP Warning: stats_stat_powersum(): Both the value and power are zero

float(0)


Alright guys! This is where we are going to be rounding up for this tutorial post. In our next tutorial, we will be studying about the PHP stats_variance() Function.

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