Can the pt by pt derivative disregard initial points?

[nicholas03]

Can the pt by pt derivative disregard initial points? The attached vi shows a spike in the beginning.  I don't know how to eliminate this.

Message Edited by nicholas03 on 02-14-2009 06:19 PM

[RavensFan · Accepted solution]

The derivative of the first point is actually undefined.  How do you want it to show up?  As a zero or not at all?

What you can do is have a case structure or select statement where if the the iteration value i = 0 then feed a zero or an NaN to the waveform chart instead of the result of the derivative function.

Message Edited by Ravens Fan on 02-14-2009 10:01 PM