Waveform Graph digital display intermittently drops to zero

[Daryl]

This one is driving me nuts.

 

Add digital display to Waveform Graph and the digital display will intermittently spike to 0 even though the data feeding it does not.  The plot on the graph will actually spike to 0 also but it does not always drop when the digital display does.  For some reason the example I have attached does not show the issue on the plot, only the legend digital display, but it does happen on the application I am working on.

 

The Waveform Array indicator does not display this same behavior.

 

What am I dong wrong here?

 

 

Using Labview version 2014

If you change the loop rate to 200ms it is much easier to see

waveform graph issue.vi

Edited February 19, 2016 by Daryl

[Yair]

LV 2015 - changed the loop rate to 200 ms and ran the code for about 30 seconds - the sine wave oscillates around 2, without dropping to zero, so I would guess something was fixed. That said, I have pretty much zero experience with the dynamic data type (I prefer types I understand), so I suppose it's possible something is happening there, but I would expect you would see the same values in the array indicator (presumably you would have to make large enough to show all the values).

[ShaunR]

Yup. I can see this too with your example (@200ms). Tried it in LV2009, 2014 & 2015 and they all exhibit the behaviour. Looks like a Graph Indicator bug since the using a "Convert From Dynamic Data" set to "scaler" and placing an indicator doesn't do it.

[Daryl]

It also happens with the waveform datatype, so it is not exclusive to the Dynamic data type.