Would this program represent dN/dt =( flux*fissionyield*Macroscopic CS) - 3.6E-6 the decay rate*N, where N is the output of the integral box

[EUSNOW]

The question refers to the left half ofthe screen for the production and decay of iodine. It is linked to the right half by the decay of iodine (lambda times N). I am confused on whether or not I should use differentiate or integrate. Thank you. This post has the screen shot I now see how to post

[GerdW]

Again a double post by EUSNOW.

Why don't you stick with your other threads here and here?

Btw. showing an image with some ExpressVIs (which hide all the important parts) is senseless! And you should clean up your BD before presenting images of it…

[Verywiseguy]

I should have checked for a third thread before bumping one of the other ones, my bad.  As I said in your second post:

"Attaching an actual vi is generally prefered over a picture by the folks here on the forums.  If the vi's aren't being attached properly, it is recommended to try zipping them, even if you are only trying to post a single vi."

I will add that you do NOT have to create an entire new post to attach a file.  Just reply somewhere in this thread.

Where exactly do your troubles start with this problem?  Are you just new to LabVIEW, or are you also inexpereinced with Differential Equations?  While I'm sure LabVIEW has some tools built in, it might be good practice to try to make some numerical solvers yourself. 

https://en.wikipedia.org/wiki/Numerical_methods_for_ordinary_differential_equations