Reference Elements in PowerShell Multidimensional Array - arrays

Question

I have CSV file
My PowerShell Script attempts to store SourceIP, DestinationIP, and Traffic in multidimensional array
$source = #((Import-Csv D:\Script\my.csv).SourceIP)
$dest = #((Import-Csv D:\Script\my.csv).DestinationIP)
$t = #((Import-Csv D:\Script\my.csv).Traffic)
$multi = #($source),#($dest),#($t)
When I try to read from first element of $multi, I expect to get a list of SourceIP
foreach ($q in $multi){
write-host $q[0]
write-host `n
}
But instead, I get SourceIP, DestinationIP, Traffic, i.e.
10.153.128.110
10.251.68.80
3.66 GB
And if I try
foreach ($q in $multi){
write-host $q[0][0][0]
write-host `n
}
I get
1
1
3
How to troubleshoot?
UPDATE
Ultimate goal is to
Count total traffic
Count traffic if SourceIP or Destination IP fits into certain pattern, i.e. 10.251.22.x
Get percentage
UPDATE II
I am able to get code to import CSV and tally total bandwidth only, but I also need bandwidth from SourceIP and DestinationIP with certain pattern.
$t = #((Import-Csv D:\Script\my.csv).Traffic)
foreach ($k in $t){
write-host $k
}
foreach ($i in $t){
$j += ,#($i.split(" "))
}
foreach ($m in $j){
switch ($m[1]){
GB {
$m[0] = [int]($m[0]) * 1000
$m[1] = 'MB'
}
MB {}
KB {
$m[0] = [int]($m[0]) / 1000
$m[1] = 'MB'
}
}
$total_bandwidth += $m[0]
}
write-host Total bandwidth is ("{0:N2}" -f $total_bandwidth) MB

Answer 1

You should not split array of object to multiple parallel arrays of properties. It is much easy to operate when objects are whole.
$Scale=#{
B=1e00
KB=1e03
MB=1e06
GB=1e09
TB=1e12
}
$TrafficBytes={
$a=-split$_.Traffic
[double]$a[0]*$Scale[$a[1]]
}
Import-Csv D:\Script\my.csv|
ForEach-Object $TrafficBytes|
Measure-Object -Sum #total traffic
Import-Csv D:\Script\my.csv|
Where-Object {$_.DestinationIP-like'10.*'}| #condition
ForEach-Object $TrafficBytes|
Measure-Object -Sum #traffic by condition

Answer 2

PetSerAl has a good idea for the conversion, but here is a way to do this that requires iterating the CSV only once and will give your percentages.
$filter = "10.251.22.*"
$Scale=#{
B=1e00
KB=1e03
MB=1e06
GB=1e09
TB=1e12
}
$myCsv = Import-Csv D:\Script\my.csv | Select-Object *, #{ Name = "TrafficBytes"; Expression = { $a = -split $_.Traffic; [double] $a[0] * $Scale[$a[1]] } }
$trafficFiltered = $myCsv | Group-Object { $_.SourceIP -like $filter -or $_.DestinationIP -like $filter } | Select-Object #{ Name = "IPFilter"; Expression = { if ($_.Name -eq $true) { $filter } else { "Other" } } }, #{ Name = "TrafficBytes"; Expression = { ($_.Group | Measure-Object -Sum "TrafficBytes").Sum } }
$trafficTotal = $myCsv | Measure-Object -Sum TrafficBytes
$trafficReport = Select-Object IPFilter, TrafficBytes, #{ Name = "Percent"; Expression = { "{0:P}" -f $_.TrafficBytes / $trafficTotal.Sum * 100.0 } }
$trafficReport