How do I create an xy chart using two independent while loops?

Hi everyone,
I am trying to develop a data acquisition program. In this program, I have two independent while loops that each output a number of type double each iteration of the loop. I am able to successfully create two independent waveform charts (data vs. time) for each of the loops when it is placed inside. However, I now want to create an xy chart of the live data (the output of one loop is x and the output of the other is y).
I am having trouble doing this because of the separate nature of the loops...when I try to pull data outside of the loops it (naturally) doesn't refresh with each loop iteration causing the xy chart to not work in the way I intend. Is there an easy way to fix this? If more clarification is needed, please let me know!
David
Solved!
Go to Solution.

Yes, more clarification is needed. Please attach your code to clarify.
I'll take a wag at it, though. It sounds like you are trying to pair X and Y data which happen during a single time chunk, then repeat, is this right? (If not, don't bother to read on.) If so, why not just use a single loop. If your VI is getting too big/complicated for comfort, just put the data-generating stuff into subVIs which run to generate a single data point, then stop, put them into a while loop and send the putputs to a graph or chart inside the loop. That way you won't extend your data trace until you get one and only one point from each subVI and things will stay synchronized.
Cameron
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Adrien wrote:
: How do I get an XY Chart to display properly while using embedded
: loops to periodically read multiple channels of similar data? (multi-Y
: versus specified time) The plot just becomes a point or a single plot
: of all values taken at one scanning of all channels. I want multiple
: plots over time updated at the time of scanning.
: I have also stored my data in a daily text file that is tab delimited.
: The text files consists of a row of text column headers, a blan
k row
: and then rows of data. The data rows are mixed data types. The first
: column is a date/time such as Mar 1, 2002 12:01 pm. The remaining
: columns are numeric data. I can't seem to get my data to plot
: properly in an XY chart from memory and am having problems parsing the
: data with mixed data types in the data rows. The format I am using
: works great for viewing the history files in Excel.
: When I plot the data, I either get a single point or a a series of
: points for a single reading of all channels or I get a line connecting
: all data for that single scan reading. What am I doing wrong? At
: this point, I don't care if I read the data from the file to plot it
: or if I can just get Labview to plot correctly as the data is gathered
: without going to the history file.
: As noted in the summary question, I have embedded loops in my
: applicaiton. I have a while-loop that determines the scan rate and
: keeps the program running until it is turned off. Inside of
that, I
: have a for-loop (in a subVI) which scans all my data channels.
: Thanks for your help.

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How do I create an xy chart using two independent while loops?

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