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 )

READ: PHP | stats_stat_percentile() Function

Parameter Details

Sr.No	Parameter	Description
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)

READ: PHP | stats_stat_innerproduct() Function

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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