Powershell how to process a variable array - arrays

Question

I have the following situation in powershell:
$arrayX = 0..1
$arrayY = 0..10
$array1 = #()
$array2 = #()
for ($i = 0; $i -lt $arrayY.Length; $i++){
$array1 += $arrayX[0] + $arrayY[$i]
$array2 += $arrayX[1] + $arrayY[$i]
}
Both $arrayX and $arrayY can be variable in length. If i extend $arrayX by 1 i'll need to adjust the code to take the third value into account. like this:
$arrayX = 0..2
$arrayY = 0..10
$array1 = #()
$array2 = #()
$array3 = #()
for ($i = 0; $i -lt $arrayY.Length; $i++){
$array1 += $arrayX[0] + $arrayY[$i]
$array2 += $arrayX[1] + $arrayY[$i]
$array3 += $arrayX[2] + $arrayY[$i]
}
What is the best practice in a situation like this to have this work automatic?

Answer 1

First, please consider not using the += operation with arrays: it will hurt performance a lot on larger arrays. Since you know the array size in advance you can allocate all required memory in advance:
$array1 = New-Object object[] $arrayY.Length
(you may want to use more specific type instead of object: int or float/double will work)
Next, instead of assigning each array to a variable, you can instead create array of arrays:
$arrayX = 0..2
$arrayY = 0..10
$resultArrays = New-Object int[][] $arrayX.Length
for ($x = 0; $x -lt $resultArrays.Length; ++$x)
{
$resultArrays[$x] = New-Object int[] $arrayY.Length
}
for ($y = 0; $y -lt $arrayY.Length; ++$y)
{
for ($x = 0; $x -lt $arrayX.Length; ++$x)
{
$resultArrays[$x][$y] = $arrayX[$x] + $arrayY[$y];
}
}
for ($x = 0; $x -lt $resultArrays.Length; ++$x)
{
Write-Output "array $($x): $($resultArrays[$x] -join ' ')"
}

Answer 2

Is this what you are looking for?
$arrayX = 0..2
$arrayY = 0..10
$arrayX | ForEach-Object {
$aX = $_
New-Variable -Name ('array' + $($aX+1)) -Value ($arrayY | ForEach-Object {$_ + $aX}) -Force
}