Why do labview programmers use 10.1Hz as the default frequency instead of an even 10.0?

It was a question that was brought up during lab class and no one had an answer for. Any ideas?
Solved!
Go to Solution.

I call it the wagon wheel effect.
In old westerns, whenever a wagon with a big spoked wheel would ride by the camera, sometimes the wheel would look like it is slowly rolling forward, sometimes slowly rolling backwards, sometimes it would look like it was at a standstill.
It is a function of the frame rate of the camera vs. the cycle period of the spokes of the wheel. If one spoke (or more) moved exactly the right distance between one frame of the movie and the next, it would look like the wheel hadn't moved at all. If it moved a little further than the rotation distance of one spoke, it would look like it is slowly rolling forward. If the wagon is a bit slower, then it would move less than the distance of one spoke and it would look like the wheel is rolling backwards.
Same thing with having a periodic waveform (each hump of the sine wave is a spoke of the wheel), and a # of samples and data acquistion rate equal to an integer number of that period (basically the frame rate of the camera.) The wagon wheel is always rolling forward. The sine wave is always oscillating. But depending on the acquisition rate vs. the sine wave frequency gives different appearance to how that sine wave looks on the graph.
Experiment and give it a 9.9 Hz sine wave, you'll see it appears to move backwards.
So my guess (and it is only a guess) is that whoever designed the express VI gave it a default of 10.1 Hz to help visually simulate on the graph the motion of the sinewave.
It really doesn't matter what they picked as the default as it is up to you as the LabVIEW programmer to change that default setting (either in the express VI or wiring in a value) to something that makes sense for your application.

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