How do I create a channel that is made up of specific data from other channels?

How do I index a specific element of a channel?  Specifically, if I have a channel of data that is 100 elements in length.  Can I create a new channel that is the sum of the 2nd, 10th, and 19th elements of my original channel?
Thanks,
Matt

After searching the message boards I came across this reply:
Dave,
I had previous built an example to perform the data reduction of every Nth point. As Otmar points out, it does have to be done in a script, but this example should simplify things for you:
Reducing a Channel in DIAdem by Pulling Every Nth Point
If you have any questions about this, please let us know. Thanks and have a good one.
Adam B.
Applications Engineer
National Instruments
I downloaded the script, and extracted the useful information.  However, when I execute my new script I recieve the error: 
Error in ReducChannelTest2 ... Unknown Runtime Error
The code I am executing is
Call ChnAlloc("Newerror0")
Call ChnAlloc("Newerror1")
chd(1,"Newerror0") =chd(21,"error0")
chd(2,"Newerror0") =chd(41,"error0")
The error0 channel is 101 elements in length.  Any thoughts?

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