How to make sure plots in xy graph are present?

Hi community,
since updating to LabVIEW 2014 this week I have an issue with code that worked previously (or didn't but the problem was unnoticable).
As shown in the example llb I created to showcase the issue, I'm filling xy graphs with quiete some data and then programatically colour the plots.
The problem is that if there are too many plots then the property nodes that are to colour the plots thow errors as if the corresponding plots were not present in the graph yet - even though I used a single frame flat sequence structure to try to make sure data is written to the plot before trying to colour them.
Maybe this would have happened in LabVIEW 2013 too - but the threshold for the number of plots was higher. All I can say is that I observed this with data sets that worked fine in LabVIEW 2013.
To reproduce simply run "colour the graphs.vi" with sufficiently high values for "numerisch" and "numerisch 2" (50 on my machine may be more on yours). I left the error out terminals of the property nodes unwired so you get taken to the right position when the error occurs.
Can I somehow check whether all plots are in the graphs yet? That way I could introduce a delay that makes sure I don't try to colour graphs that aren't there yet - regardless of the speed of the target PC.
Has xy graph behavior changed in LabVIEW 2014? Or maybe its performance?
Best regards
Florian
Solved!
Go to Solution.
Attachments:
colour.llb ‏194 KB

Florian,
i cannot run your example as it requires some VIs from a LAVA-library (which i dont have installed).
Nevertheless, there are some questions i am stumbling about:
1. Why do you use a local variable rather the terminal to pass all plots to the indicator?
2. If you place a wait function in the sequence frame which waits longer than the expected time for passing the data, does the error still occur?
3. Do you run into the error if you enable panel updates before coloring the plots in order to slow coloring down?
I can imagine that you have a race condition against the UI thread. The local variable (just like the terminal) has a buffer where the data is copied to. The UI thread will retrieve the data as soon as it is ready. I would expect the coloring to require the data be present in the UI thread already (in order to "acknowledge" the plot). So if, for any reason, the UI thread only cought 98% of all plots when you start recoloring, you race against the transfer of the last 2%.. depending on the UI thread execution speed, you can run into the error or maybe not.
That is the reason why i want you to test for waiting times or slowing down the coloring.
Norbert
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How to make sure plots in xy graph are present?

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