"Concatenating" Channels?

[Julia Dawkins]

Hi,

I am using DIAdem 10.0.  I need to load several data sets into the data portal (each data set will be in one group).  Each data set has the same (or similar) channels.  For example, a simplified list of my channels:

Group1/ChannelA

Group2/ChannelA

Group3/ChannelA

...

GroupN/ChannelA

I need to "combine" all of the similar channels (ChannelA in my example) into one channel (CombChannelA) so I can create 3D graphs.  Is there a quick way to do this?  This is what I have been doing, and it is kind of slow:

 ChannelNameToCombine

  NewChnLength = 0
  NewChnName = "(Joint) " & ChannelNameToCombine
 
  ChnGroupArr = Split(ChnGroupStr, ", ")
  ChnArr = Split(ChnStr, ", ")

  For k = 0 To UBound(ChnGroupArr) - 1
    NewChnLength = NewChnLength + ChnLength(ChnGroupArr(k) & "/" & ChnArr(k))
  Next ' i

  Call GetCreateChannel(GroupIndexGet("Combined Channels"), NewChnName, NewChnLength)

  Row = 1
  For k = 0 To UBound(ChnGroupArr) - 1
     For l = 1 To ChnLength(ChnGroupArr(k) & "/" & ChnArr(k))
        ChDX(Row, CNo("Combined Channels/" & NewChnName)) = ChDX(l, CNo(ChnGroupArr(k) & "/" & ChnArr(k)))
        Row = Row + 1
      Next ' l
  Next ' k

[Julia Dawkins]

Sorry, I didn't finish: 

  ' I am looping through all data in the poral to get ChnGroupStr and ChnStr

  ChnGroupStr = "1, 2, 3, 4, 5"

  ChnStr = "ChannelA, ChannelA, ChannelA, ChannelA, ChannelA"

  ChannelNameToCombine = "ChannelA"

  NewChnLength = 0
  NewChnName = "(Joint) " & ChannelNameToCombine
 
  ChnGroupArr = Split(ChnGroupStr, ", ")
  ChnArr = Split(ChnStr, ", ")

  For k = 0 To UBound(ChnGroupArr) - 1
    NewChnLength = NewChnLength + ChnLength(ChnGroupArr(k) & "/" & ChnArr(k))
  Next ' i

  Call GetCreateChannel(GroupIndexGet("Combined Channels"), NewChnName, NewChnLength)

  Row = 1
  For k = 0 To UBound(ChnGroupArr) - 1
     For l = 1 To ChnLength(ChnGroupArr(k) & "/" & ChnArr(k))
        ChDX(Row, CNo("Combined Channels/" & NewChnName)) = ChDX(l, CNo(ChnGroupArr(k) & "/" & ChnArr(k)))
        Row = Row + 1
      Next ' l
  Next ' k

[AndreasH_Ha]

Hello Julia,

please see "ChnConcat". This function concatenates two channels and should do what you are looking for. Its definitely much faster than copying all teh channels value by value.

Andreas

[Brad_Turpin]

Hi Julia,

This is a common use-case.  Check out the following Example Program on the ni web:

http://sine.ni.com/apps/we/niepd_web_display.DISPLAY_EPD4?p_guid=C34F36CBFA7173C3E034080020E74861&p_...

Make sure you choose the "_91_" version, which is more robust, more full-featured, and faster (but will only run on DIAdem 9.1 or later).  If you are loading TDM files, just use the "Binary_Files" version and type in "TDM" for the DataPlugin name in the VBScript.

Ask if you have further questions,
Brad Turpin
DIAdem Product Support Engineer
National Intruments