How do I write to file at a discrete time step?

I'm writing some variables out to a binary file in real-time (xpos, ypos, elapsed time) with a while loop (see blockdiag.png). I'm using the time recorded by LabVIEW with an external devices clock to interpolate position values, before you ask, I don't have access to the external clock so interpolation is necessary after the data has been collected. Currently, the while loop is unabated and runs as fast as the CPU will let it. After I'm done collecting my data, I plotted up the elapsed time in MATLAB and noticed some very strange behavior, negative time (see clocks.png)!!!! The black data here is my external devices clock and the red data represents the elapsed time written out by LabVIEW. There are two instances in the vector that indicate a large negative step in time. This doesn't always happen and seems to occur somewhat spontaneously within the elapsed time vector.
Questions:
1) Has anyone seen this behavior before?
2) Would putting a Wait.vi in the while loop help? (I figured this would at least regularize the time step.)
3) Please help.
Much thanks, please don't judge my LabVIEW code (I'm sure there are better ways to do it, but it works and that is how I want it).
Adam
Solved!
Go to Solution.
Attachments:
blockdiag.png ‏302 KB
clocks.png ‏12 KB

AdamBlues wrote:
Much thanks, please don't judge my LabVIEW code (I'm sure there are better ways to do it, but it works and that is how I want it).
Adam
I just wanted to make a brief comment regarding the above statement. I would recommend that you be open to changes to your code. There are many VERY experienced LabVIEW developers on these forum and there is always an opportunity to learn and improve your code. Just because something works doesn't mean that the code can't be improved dramatically. You may find that being open to suggestion will result in you becoming a better programmer and that your applications are more stable, robust and easier to maintain. For example, more often that not you are much better office using a state machine to replace a flat sequence structure. Learn how to use dataflow properly and the need for sequence structures generally disappears. These are just a few things that can be done.
I guess my point is that it is a good idea to try and remain open above suggestions to improve or change your code.
Mark Yedinak
"Does anyone know where the love of God goes when the waves turn the minutes to hours?"
Wreck of the Edmund Fitzgerald - Gordon Lightfoot

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Posted: Mar 18, 2011 2:30 PM - Madhu This is very urgent and critical.>
You have to understand that forum contributers are all volunteers - this is not our full-time job. If your issue is truely urgent I suggest you open a Service Request (SR) with Oracle Support! ;-)
Craig B-)
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