mirror of
https://github.com/fleschutz/PowerShell.git
synced 2024-12-01 20:33:31 +01:00
124 lines
4.1 KiB
Markdown
124 lines
4.1 KiB
Markdown
Script: *measure-BucketSort.ps1*
|
|
========================
|
|
|
|
This PowerShell script measures the speed of the BucketSort algorithm.
|
|
BucketSort is a sorting algorithm that works by distributing the elements
|
|
of an array into a number of buckets. Each bucket is then sorted individually,
|
|
either using a different sorting algorithm, or by recursively applying the bucket
|
|
sorting algorithm. It is a distribution sort, a generalization of pigeonhole sort
|
|
that allows multiple keys per bucket, and is a cousin of radix sort in the
|
|
most-to-least significant digit flavor. Bucket sort can be implemented with comparisons
|
|
and therefore can also be considered a comparison sort algorithm. The computational
|
|
complexity depends on the algorithm used to sort each bucket, the number of buckets
|
|
to use, and whether the input is uniformly distributed.
|
|
|
|
Parameters
|
|
----------
|
|
```powershell
|
|
PS> ./measure-BucketSort.ps1 [[-numIntegers] <Int32>] [<CommonParameters>]
|
|
|
|
-numIntegers <Int32>
|
|
Specifies the number of integers to sort
|
|
|
|
Required? false
|
|
Position? 1
|
|
Default value 1000
|
|
Accept pipeline input? false
|
|
Accept wildcard characters? false
|
|
|
|
[<CommonParameters>]
|
|
This script supports the common parameters: Verbose, Debug, ErrorAction, ErrorVariable, WarningAction,
|
|
WarningVariable, OutBuffer, PipelineVariable, and OutVariable.
|
|
```
|
|
|
|
Example
|
|
-------
|
|
```powershell
|
|
PS> ./measure-BucketSort.ps1
|
|
🧭 0.065 sec to sort 1000 integers by BucketSort
|
|
|
|
```
|
|
|
|
Notes
|
|
-----
|
|
Author: Markus Fleschutz | License: CC0
|
|
|
|
Related Links
|
|
-------------
|
|
https://github.com/fleschutz/PowerShell
|
|
|
|
Script Content
|
|
--------------
|
|
```powershell
|
|
<#
|
|
.SYNOPSIS
|
|
Measures the speed of BucketSort
|
|
.DESCRIPTION
|
|
This PowerShell script measures the speed of the BucketSort algorithm.
|
|
BucketSort is a sorting algorithm that works by distributing the elements
|
|
of an array into a number of buckets. Each bucket is then sorted individually,
|
|
either using a different sorting algorithm, or by recursively applying the bucket
|
|
sorting algorithm. It is a distribution sort, a generalization of pigeonhole sort
|
|
that allows multiple keys per bucket, and is a cousin of radix sort in the
|
|
most-to-least significant digit flavor. Bucket sort can be implemented with comparisons
|
|
and therefore can also be considered a comparison sort algorithm. The computational
|
|
complexity depends on the algorithm used to sort each bucket, the number of buckets
|
|
to use, and whether the input is uniformly distributed.
|
|
.PARAMETER numIntegers
|
|
Specifies the number of integers to sort
|
|
.EXAMPLE
|
|
PS> ./measure-BucketSort.ps1
|
|
🧭 0.065 sec to sort 1000 integers by BucketSort
|
|
.LINK
|
|
https://github.com/fleschutz/PowerShell
|
|
.NOTES
|
|
Author: Markus Fleschutz | License: CC0
|
|
#>
|
|
|
|
param([int]$numIntegers = 1000)
|
|
|
|
class BucketSort {
|
|
static Sort($targetList) {
|
|
|
|
$max = $targetList[0]
|
|
$min = $targetList[0]
|
|
|
|
for ($i = 1; $i -lt $targetList.Count; $i++) {
|
|
if ($targetList[$i] -gt $max) { $max = $targetList[$i] }
|
|
if ($targetList[$i] -lt $min) { $min = $targetList[$i]}
|
|
}
|
|
|
|
$holder = New-Object object[][] ($max - $min + 1)
|
|
|
|
for ($i = 0; $i -lt $holder.Count; $i++) {
|
|
$holder[$i] = @()
|
|
}
|
|
|
|
for ($i = 0; $i -lt $targetList.Count; $i++) {
|
|
$holder[$targetList[$i] - $min]+=$targetList[$i]
|
|
}
|
|
|
|
$k = 0
|
|
|
|
for ($i = 0; $i -lt $holder.Count; $i++) {
|
|
if ($holder[$i].Count -gt 0) {
|
|
for ($j = 0; $j -lt $holder[$i].Count; $j++) {
|
|
$targetList[$k] = $holder[$i][$j]
|
|
$k++
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
$list = (1..$numIntegers | foreach{Get-Random -minimum 1 -maximum $numIntegers})
|
|
$stopWatch = [system.diagnostics.stopwatch]::startNew()
|
|
[BucketSort]::Sort($list)
|
|
[float]$elapsed = $stopWatch.Elapsed.TotalSeconds
|
|
$elapsed3 = "{0:N3}" -f $elapsed # formatted to 3 decimal places
|
|
"🧭 $elapsed3 sec to sort $numIntegers integers by BucketSort"
|
|
exit 0 # success
|
|
```
|
|
|
|
*(generated by convert-ps2md.ps1 using the comment-based help of measure-BucketSort.ps1 as of 03/27/2024 17:36:29)*
|