Let's "begin at the beginning". I'm assuming when you say "model sin(a*t) with 1 step from t = 0 to 100", what you mean is that you want to use values of t that start at 0, then 1, then 2, ... then 100. I'm going to stick with "plain LabVIEW" (skipping Control & Stimulation loop).
You need a Loop. Since you know the values of t, you know how many times the loop needs to run (is it clear that N = 101, not 100?), so a For loop sounds simpler than a While. The Index in a For (or While) loop takes on integer values, 0,1,..., just what you want for "t". By convention, the index is symbolized by "i" and is an integer, so why not use it? [You can always pass the I32 "wire" through a "to Dbl" if you want]. So now you need sin (a*t). First, do a*t (or a*i), where "a" is probably a Front Panel numeric Dbl control (so you can let the user "choose" it before the program runs). You can find the "sin" function on Mathematics palette on the Block Diagram (look in the "Elementary" sub-panel under "Trigonometry". The output will be sin(a*t) for each of the 101 loops that the For Loop executes.
If you are using a Control & Simulation loop, surely you know all of this, right? So help us understand what the real question or problem you are having. It seems illogical to me that you'd be using Control and Simulation loops without being able to understand how to use a loop to produce 101 points of a sinusoid ...
Bob Schor
