Powershell to create line chart from EXCEL

Question

My powershell script inputs data into EXCEL worksheet

and I am trying to c

Answer 1

Degustaf is 100% correct, his is the correct answer, but you have a lot of extra stuff in there that isn't needed. I can replicate your desired outcome including populating the spreadsheet with your test data, and do it in fewer lines than what you have. Here, check this out, you may come away with a few pointers for your future endeavors.

#Test Data
$Data=("8/15/2014",3091),("8/14/2014",240),("8/13/2014",519),("8/12/2014",622),("8/11/2014",2132),("8/10/2014",1255),("8/9/2014",3240)|ForEach{[PSCustomObject][Ordered]@{'Date_to_Display'=$_[0];'Number_of_Computers'=$_[1]}}

$xlConditionValues=[Microsoft.Office.Interop.Excel.XLConditionValueTypes]
$xlTheme=[Microsoft.Office.Interop.Excel.XLThemeColor]
$xlChart=[Microsoft.Office.Interop.Excel.XLChartType]
$xlIconSet=[Microsoft.Office.Interop.Excel.XLIconSet]
$xlDirection=[Microsoft.Office.Interop.Excel.XLDirection]

$xl = new-object -ComObject Excel.Application
$wb = $xl.workbooks.add()
$ws = $wb.activesheet
$xl.Visible = $true

#Populate test data onto worksheet
$Data |ConvertTo-CSV -NoTypeInformation -Delimiter "`t"| c:\windows\system32\clip.exe
$ws.Range("A1").Select | Out-Null
$ws.paste()
$ws.UsedRange.Columns.item(1).numberformat = "ffffdd, mmm dd, yyyy"
$ws.UsedRange.Columns.AutoFit() |Out-Null

#Create Chart
$chart=$ws.Shapes.AddChart().Chart
$chart.chartType=$xlChart::xlLine

#modify the chart title
$chart.ChartTitle.Text = "Number of Computers"

$ws.shapes.item("Chart 1").top=40

If you work with Powershell and Excel much you'll probably find the line up there $Data|ConvertTo-CSV... extremely useful.