Step function

I have created a step function using a case structure within a while loop using shift registers. (I'm sure this probably isnt the best way to make a step function but its the only way I know how) Anyways I have two questions regarding my step function. First: How do I make the function start at 0 each time I start the program? If I stopped the program at 4, it will begin at 4 when I restart the program. I want it to begin from 0 next time I restart the program, even if I stopped it at 4 the previous run. Second: The graph of my step function looks like a sawtooth wave rather than a step function because it is only taking one measurement before moving on the the next step. How do I get it to look more like a step function? I have attached the VI of my step function. I would also appreciate it if somebody shows me how to make a step function in a more efficient way. I know there is a step function VI but I could not figure out how it works.
Attachments:
Step function.vi ‏14 KB

I found this on the forums a while ago and I am actually using it in a project right now. So, I can't take credit for coming up with this. I definitely suggest doing a search before posting, because often times your question will already be answered. This essentially does a ramp pattern, and uses rounding of decimals to round the numbers off to a flat line if you're between two step values. You can find the ramp pattern VI in the palettes.
CLA, LabVIEW Versions 2010-2013
Attachments:
stepfunction.png ‏5 KB

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