Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

  • Congratulations Mike Lewis on being selected by the Tek-Tips community for having the most helpful posts in the forums last week. Way to Go!

Find out Text data in CSV File Numeric Columns in Powershell

Status
Not open for further replies.

BTrees

IS-IT--Management
Aug 12, 2006
45
CA
Hell Everyone

I am very new in powershell. I have a requirement to code some tests in Powershell.
I am trying to validate a CSV file by finding out if there is any text value in my numeric fields.

This is my source data like this
ColA, ColB , ColC , ColD,
23 , 23 , ff , 100,
2.30E+01, 34, 2.40E+01, 23
df , 33 , ss , df
34 , 35 , 36 , 37

Required out put
ColA, ColC, ColD
2.30E+01, ff, df
df, 2.40E+01
, ss

I have tried
cls

function Is-Numeric ($Value) {
return $Value -match "^[\d\.]+$"
}

$arrResult = @()
$arraycol = @()

$FileCol = @("ColA","ColB","ColC","ColD") .. These are some of the specific columns that are numeric in file

$dif_file_path = "C:\Users\$env:username\desktop\f2.csv"

#Importing CSVs

$dif_file = Import-Csv -Path $dif_file_path -Delimiter ","

############## Test Datatype (Is-Numeric)##########

foreach($col in $FileCol)
{
foreach ($line in $dif_file) {

$val = $line.$col

$isnum = Is-Numeric($val)

if ($isnum -eq $false) {
$arrResult += $line.$col
$arraycol += $col

}
}
}
[pscustomobject]@{$arraycol = "$arrResult"}| out-file "C:\Users\$env:username\Desktop\Errors1.csv"
####################

I am not getting proper output as required with this file.
Any help in this regard?
Thanks
 
few things.

first your headers do not match the names you are using - by having it on the CSV with spaces between the commas the names no longer match.
e.g. "ColA" <> "ColA " -- notice the space. so doing a $line.$col will fail to find it

Second - assuming you don't use my function below you need to trim the values when checking for numeric - otherwise your code will return false where the columns contain a space - "123 " is false

third - exponential numbers are, as name says, numeric - e.g. 2.30E+01 is a valid numeric value (23 in this case)

as for getting the output exactly as you mention - you can loop through the array and output it - this you should be able to google or figure out yourself.

below the code I would use - it does deal with exponential numbers correctly (which your code does not)
Code:
function Is-Numeric2 ($Value) 
{
    if ($Value -eq $null)
    {
        return $false
    }
    else
    {
        try
        {
           $v=[double]$Value
           return $true
        }
        catch
        {
           return $false
        }
    }
}

$arrResult = @()
$arraycol = @()

$FileCol = @("ColA","ColB","ColC","ColD") #.. These are some of the specific columns that are numeric in file

$dif_file_path = "C:\temp\f2.csv"

#Importing CSVs

$dif_file = Import-Csv -Path $dif_file_path -Delimiter ","

############## Test Datatype (Is-Numeric)##########

foreach($col in $FileCol)
{
    foreach ($line in $dif_file) {

        $isnum = Is-Numeric2($line.$col)
        if ($isnum)
        {
            # output values just to show which ones were considered numerics and its conversion
            Write-Host "$val = $([double](([string]($val)).Trim()))"
        }

        if (!$isnum)
        {
            $arrResult += $line.$col
            $arraycol += $col
        }
    }
}

[pscustomobject]@{$arraycol = "$arrResult"}| out-file "C:\temp\Errors2.csv"

Regards

Frederico Fonseca
SysSoft Integrated Ltd

FAQ219-2884
FAQ181-2886
 
Thank you very much Frederico for the solution. I got Ideas , so far the following works for me

$arrResult = @()
$columns = "ColA","ColB","ColC","ColD"
$dif_file_path = "C:\Users\$env:username\desktop\f1.csv"
$dif_file = Import-Csv -Path $dif_file_path -Delimiter "," |select $columns
$columns = $dif_file | Get-member -MemberType 'NoteProperty' | Select-Object -ExpandProperty 'Name'
foreach($row in $dif_file) {
foreach ($col in $columns) {
$val = $row.$col
$isnum = Is-Numeric($val)
if ($isnum -eq $false) {
$arrResult += $col+ " " +$row.$col
}}}
$arrResult | out-file "C:\Users\$env:username\desktop\Errordata.csv"

It gives me correct result as required. I need to exclude scientific notation if found.
Though correct result but out put is not in proper format likd
ColA ss
ColB 5.74E+03
ColA ss
ColC rrr
ColB 3.54E+03
ColD ss
ColB 8.31E+03
ColD cc
any idea to improve format? thanks
 
Status
Not open for further replies.

Part and Inventory Search

Sponsor

Back
Top