Updating a single plot

Hi,
I have an XY graph with four plots. Three of these plots are related and the fourth is a circle around them. The circle's diameter is controlled by a control on the front panel. I want the XY graph to update whenever that value is changed, so I have used an event structure. I have not posted my code because this is all part of a much larger program so my vi would potentially make no sense. The problem I am having is that I need to update the circle (an array of points) without changing whatever values are being displayed in the other plots. How do I keep 3/4 of the plots with their current value while changing the 4th plot?
Any assistance would be appreciated, thank you in advance.
Jeff
Using Labview 7 Express

Thank you for the reply. I dont have a single array that represents the values on the xy chart, There are a number of arrays in different places of the vi that are passed into local variables representing the chart depending on user interaction with the program (I have a large event structure). So it is impossible for me to simply replace one of the arrays while it is passed into the xy chart, although I agree that would normally be the easiest way. Whenever I am changing the value of the chart, I bundle 4 clusters (each is a cluster of two doubles) into a cluster array, which i send into the xy chart. So, I tried to do something where I created a local variable and used it to read the array of clusters currently being displayed on the chart, and then unbundled this into its seperate clusters (I would then replace the relevant cluster). However, for some reason the array of clusters being read from the chart only has a size of 1 (instead of the expected size of 4), so obviously it is impossible for me to replace the relevant subset. I had thought of the possibility where I could create 3 seperate indicators, and each one would represent the current value of each of the elements in the cluster array (except for the element that is going to be replaced (the circle)), but this is a very messy way of doing it, and I believe that there must be a more efficient way of doing this, since it would be impossibly messy if I had any more plots!
Does anyone know a more efficient way to do this?
Jeff
Using Labview 7 Express

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How can I update single plot in multi plot xy graph?

Hi all,
I'm working on an HMI "front" for a larger acquisition/analysis system, that includes continuous performance monitoring of a turbine. The results of the measurements are stored arrays of contour lines, that represents turbine efficiency and guide vane openings. This analysis is all performed in the background. In the HMI, the performance data is loaded from file when the specific "report" is requested, and is plotted in an XY graph. I would like to indicate the current operation point of the machine by using a plot that is a single point. Thus, that point's position among the contour lines indicates the current performance of the turbine. This point is updated once every second, while the performance data remains the same for considerable amounts of time between recalculations (days to weeks).
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Go to Solution.

You cannot redraw a single plot. If you want to update a single plot, you need to retain all plots in a shift regsiter and replace the data of the desired plot. However, your problem seems much simpler than that. To show a single point on a nearly static plot you have several options.
You can use a cursor that is controlled programmatically (the style can be a point, don't allow drag).
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You can use the "plot images" feature that allows you to use image commands to draw anything on top of a graph.
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wrote:
>>
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>>
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>>
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>
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