Hey Sarahg,
The easiest way to accomplish this will be to create a new channel for the subset of data, and perform the calculations on that new channel. While there are some ways to create a new channel manually, the easiest way to do this will be with a simple script. I'll paste in the script itself, and then explain it.
Option Explicit 'Forces the explicit declaration of all the variables in a script.
Dim firstVal, secondVal, firstIndex, secondIndex
firstIndex = 2
secondIndex = 5
Call DataBlCopy(Ch("Speed"),firstIndex, secondIndex-firstIndex, Ch("Test"),1)
Here's what that does:
-Define some variables for use later.
-firstIndex and secondIndex are the two indices of interest; in your example, they were 721 and 1441. I just put in numbers for these, but you could easily put a calculation there with the PNo command you mentioned.
-The DataBlCopy actually creates the new channel. The first argument is the channel to copy FROM, so Ch("Speed") is copying from a channel called Speed.
- firstIndex is your first index (721 in your case).
-The next argument is the number of rows to copy. To obtain this value, I did secondIndex-firstIndex.
-The next argument is the channel to copy TO. So Ch("Test") means we're copying to a channel called Test.
-The last argument is the starting index in that new channel. It will always be 1 (we want to copy starting at the beginning of the channel).
Once you have the new channel, you can simply use your statistical analysis functions on the new channel. I think this is the easiest way to accomplish the task, and will make it very easy to automate this process later. Please let me know if you have any questions about how to implement it!
-
