Rif.: Integration between a range within a channel

[DTS_PBO]

Afternoon,

I'm trying to integrate some data but rather than integrate a whole channel of data as the Integrate function appears to do is it possible to specify a start and end reference within the channel so it just integrates a certain section of the data?

This will form part of a larger script so I'm happy for it to be a script solution if that helps. 

Thanks

[panta1978 · Accepted solution]

I think you cannot directly do it, but I was thinking of a 2-step process that could do the job.

Basically:

• First you create a channel that is equal to 0 outside the integration range, and it is equal to your channel inside
• Then you integrate this channel

Imagine you want to integrate the Example/Speed channel from T=5 to T=30.

You can create a channel Speed_W with ChnEventCreateFilteredTrueChn function, then integrate it.

Below the code. Hope it will help.

ChnEventResultList = ChnEventFind("(A>5) and (A<30)", Array("A"), Array(Data.GetChannel("Example/Time")))
Call ChnEventCreateFilteredTrueChn("Example/Speed_W", ChnEventResultList, "Example/Speed", 0)
Set ChnResult = ChnIntegrate("Example/Time", "Example/Speed_W", "Example/Speed_W_Int", "TrapezoidalRule", 0, False, 0)

[DTS_PBO]

Thanks! This approach worked nicely.