Waveform Chart - Plot every n Samples

[engrstudent1]

Hello, all, I have a question that has been bugging me for days. I'm running a main VI that records an "hour:" ever twelve iterations of the while loop. This probably isn't the most efficient way to do this, but that's not what I'm trying to change. I'm tracking another variable (energy) that I want to plot against "hours". My question is, how can I use the waveform chart to plot the value of "energy" every "hour", i.e. every twelve iterations?

I'm not using a real-time-stamp, though. This is pure simulation, it doesn't necessarily have to model actual time.

[Muri777]

I think it needs more context but it depends on how you want to do it. If all you care about is just plotting once every hour you can just put it in a while loop with 1 hour wait time. Otherwise you can set it to log once every hour which would be better but depends on what you wanna do... maybe like this? i dunno

[crossrulz · Accepted solution]

12 iterations per hour?!  That is one SLOW loop.  Typically, you want your loop rates to be more of the 100 to 500ms per iteration.

Anyways, use a shift register to hold a counter that you increment each iteration.  When you have reached your "hour", write to the chart and reset your counter.  Use a case structure.

[Muri777]

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@crossrulz wrote:

12 iterations per hour?!  That is one SLOW loop.  Typically, you want your loop rates to be more of the 100 to 500ms per iteration.

Anyways, use a shift register to hold a counter that you increment each iteration.  When you have reached your "hour", write to the chart and reset your counter.  Use a case structure.

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This is probably better than my suggestion 

[engrstudent1]

It isn't an actual hour, it's just a figurative hour for simulation purposes. I currently have each iteration taking about 25 ms but I'll increase it once I have the entire thing working.

Thanks for the reply, I will try this.

[engrstudent1]

Thanks - it worked.