This one should appeal to both the statistically inclined of you, as well as those interested in cryptography. Measure-Frequency will take any array (or string) and give you the frequency distribution of it’s contents.
| function Measure-Frequency { | |
| <# | |
| .SYNOPSIS | |
| Get the frequency distribution of a set. | |
| .DESCRIPTION | |
| This function will get the frequency distribution of a set (array) of data. | |
| It supports array types, as well as strings. | |
| .EXAMPLE | |
| Measure-Frequency $array | |
| .EXAMPLE | |
| Measure-Frequency $string -CaseSensitive | |
| .NOTES | |
| Author: Øyvind Kallstad | |
| Date: 10.02.2016 | |
| Version: 1.0 | |
| #> | |
| [CmdletBinding()] | |
| param ( | |
| [Parameter(Mandatory = $true, Position = 0)] | |
| $InputObject, | |
| [Parameter()] | |
| [switch] $CaseSensitive | |
| ) | |
| try { | |
| if ($InputObject.GetType().Name -eq 'String') { | |
| if ($CaseSensitive) { | |
| $inputArray = $InputObject.ToCharArray() | |
| } | |
| else { | |
| $inputArray = $InputObject.ToLower().ToCharArray() | |
| } | |
| } | |
| else { | |
| $inputArray = $InputObject | |
| } | |
| $inputArray | Group-Object | Sort-Object –Descending –Property Count | ForEach-Object { | |
| $frequency = $_.Count / $inputArray.Length | |
| $percent = '{0:P0}' -f $frequency | |
| Write-Output ([PSCustomObject] [Ordered] @{ | |
| Value = $_.Name | |
| Count = $_.Count | |
| Percent = $percent | |
| Frequency = $frequency | |
| }) | |
| } | |
| } | |
| catch { | |
| Write-Warning $_.Exception.Message | |
| } | |
| } |
