Generate output based on the analysis of a input array

Question

Hello!
I would appreciate some help with this:
- I have an input array X. It is a phase array, in other words, it has values from -pi to pi. 
- I want to create digital pulses that match with certain values of phases in X. Example: If a value of X, in position "5", is -3*pi/2, i would like to generate , in the output array Y, a value of 1 in its position "5".
My problem here is that i am not being able to detect the position of the array where my condition is met. I tried to use a case structure and a for to do this, without success.
I hope i was clear enough, thank you very much.

Answer 1

Ok, now that i Got the phases, i have to generate the output. Knowing the period of the phases wave and the timing of a certain phase, i want to generate a digital output in a future time that falls in the specified phase. It's a closed-loop of stimulation. What i'm trying to do is this:
- First of all, I get the phases like Altenbach said.
- Then, i do the time calculus to predict time intervals that i would wait to generate my pulse, and that pulse should fall in the specified phase of the input waveform, since its a closed-loop system.
I'm attaching the current vi that i designed, and I appreciate any help. 
The real trouble now is generate the output pulse/ boolean in the right time, with a duration of, i dont know, 10ms, just to make it work. something like this: _______|              |________
                                                                                                                                                                                                                                            <--10ms-->
Best Regards,
Attachments:
PLOT_SIGNAL_ALTERNATIVA.vi ‏67 KB