## macfja /math

A set of tools around Mathematics.

##### Details

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dev-master 2015-10-03 15:51 UTC

This package is auto-updated.

Last update: 2024-02-16 23:06:33 UTC

A set of class and function around Mathematics.

## What inside ?

### CombinationBuilder

An utility class to create combination. The class also provide a factorial calculation.

## Example and Usage

### Combination

Get for 3 in 5:

`print_r(CombinationBuilder::getCombination(5, 3));`

Will output:

``````Array
(
[1-2-3] => Array
(
[0] => 1
[1] => 2
[2] => 3
)

[1-2-4] => Array
(
[0] => 1
[1] => 2
[2] => 4
)

[1-2-5] => Array
(
[0] => 1
[1] => 2
[2] => 5
)

[1-3-4] => Array
(
[0] => 1
[1] => 3
[2] => 4
)

[1-3-5] => Array
(
[0] => 1
[1] => 3
[2] => 5
)

[1-4-5] => Array
(
[0] => 1
[1] => 4
[2] => 5
)

[2-3-4] => Array
(
[0] => 2
[1] => 3
[2] => 4
)

[2-3-5] => Array
(
[0] => 2
[1] => 3
[2] => 5
)

[2-4-5] => Array
(
[0] => 2
[1] => 4
[2] => 5
)

[3-4-5] => Array
(
[0] => 3
[1] => 4
[2] => 5
)

)
``````

Or in a more compact way:

``````(1, 2, 3)
(1, 2, 4)
(1, 2, 5)
(1, 3, 4)
(1, 3, 5)
(1, 4, 5)
(2, 3, 4)
(2, 3, 5)
(2, 4, 5)
(3, 4, 5)
``````

### Combination Count

Get the number of possible combination

``````print_r(CombinationBuilder::getCombinationCount(5, 3));
``````

Will output:

``````10
``````

### Factorial

Get the factorial of 5 (`5!`)

``````print_r(CombinationBuilder::factorial(5));
``````

Will output:

``````120
``````