How can I sort channels by a custom property?

Question

Hello.
I have written a script that creates a series of formatted charts in View.  The data comes from TDMS files with several groups of channels with some custom properties assigned to the channels.  I would like to sort the channels within each group by one of these custom properties so that the curves display in the desired order.
It appears that ChnMove and ChnRenumber can be used to reorder the channels, but how can I programatically sort the channels by a channel property?
Thanks,
Craig

Answer 1

Hello Craig!
Unfortunately DIAdem doesn't have a adequate command. You have to use some lines of script code. Try this bubblesort adaption:
Option Explicit
Call GroupChnSort(1,"name")
Sub GroupChnSort(ByRef nGroupIndex, ByRef sgPropName)
Dim i
Dim j
Dim n
Dim anCNo()
If GroupChnCount(nGroupIndex) > 1 Then
ReDim anCNo( GroupChnCount(nGroupIndex)-1 )
For i=1 To GroupChnCount(nGroupIndex)
anCNo(i-1) = i
Next
For i = 0 to UBound(anCNo)
For j = i+1 to UBound(anCNo)
If ChnPropValGet("[" & nGroupIndex & "]/[" & anCNo(i) & "]", sgPropName) > _
ChnPropValGet("[" & nGroupIndex & "]/[" & anCNo(j) & "]", sgPropName) Then
n = anCNo(i)
anCNo(i) = anCNo(j)
anCNo(j) = n
End If
Next
Next
For i=1 To GroupChnCount(nGroupIndex)
Call ChnMove( anCNo(i-1), nGroupIndex, i)
Next
End If
End Sub
The string compare is casessensitive. You can wrap the ChnPropValGet with a UCase to change this.
Matthias
Matthias Alleweldt
Project Engineer / Projektingenieur
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