Best way to create array from sampled signal???

I'm not sure exactly how to pose this question (been using labview for less than 2 weeks). I'm trying to graph the position of a motorized stage being run though an old Newport controller. I can obtain the position no problem. My sub-routine to get the position is in a while loop that repeats every 200 ms. I added a shift register to keep create an index to make the array, but it only stores the final position in the middle of the array, and puts zeros everywhere else (I initialized a large array outside the loop so it's basically just not writing anything except for that one value).
When I use the probe the index and position values change together, I just don't understand why it doesn't store.
Sorry if this is vague, I'm just not sure how to store these values to plot them. Any help is apprecated.
Thanks
Tim

I'm unclear from you message exactly what you are doing with the shift register, but if you create an array outside the loop, of the maximum size expected (with a little more in case your guestimate is wrong) then use the loop index to index a "replace array subset" to replace the 0 value with your new value. Alternatively, create a null array of the right data type (an array constant) and do an append. Or just lead the value to the loop edge and enable indexing. The first two allow you to "see" the array during the running, the later one only allows you to see the results when the loop is stopped.
P.M.
Putnam
Certified LabVIEW Developer
Senior Test Engineer
Currently using LV 6.1-LabVIEW 2012, RT8.5
LabVIEW Champion
Attachments:
adding to loop.vi ‏43 KB

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