Why does the period display NaN? What does it mean "NaN"?
I have a vi that is supposed to measure values of period 3 and 2 tension using DAQmx. The vi is attached.
When I run the vi, I get no error, but one of the counters display NaN instead of a period (in seconds) value. Why would this counter not appearing? See the .jpg image of the screenshot, which shows the lights on the front panel, after execution and stop the vi. Note that the period 2 shows "NaN" but, period 1 and 3 show a real value. "NaN" only displays in "period 2" executing too. ' " "Period 2" never displays a numeric value. Moreover, as "NaN" actually mean?
Appreciate your thoughts.
Thank you
Dave
(using 3 counters in the cDAQ-9174 and the module OR 9401 plugged into the chassis cDAQ; periods are measured from the encoders)
NaN means not 'a number '.
In your code, Mean.vi will return NaN (with the error-20003) if the input array is empty.
What happens if you connect the signal of the 1 meter or 3 to counter 2? If NaN disappears, then there is a problem with the signal currently connected to the meter 2.
- Your current code, using usrs to (unitialized shift registers), will produce NaN when running for the first time.
- The size of the usrs to will increment at each iteration.
- If your VI is used as a Subvi, the means will be bad for the first 15 iterations since they will be calculated with the values of the usrs to--> previous lengths.
You must use PtByPt.vi means that will calculate the average of the X last values without above mentioned problems.
Tags: NI Hardware
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