LabVIEW
How to record and plot only the zoomed portion of a Graph or Chart?
@pradeep Patil wrote:
... onto other.
other what???
Once you are zoomed in, you only plot the zoomed data anyway.
If you want to graph the zoomed data on another graph, you can either zoom the other graph to the same axis ranges or you can use the axis boundaries to create a subset of the data.
Can you attach some simple code with data to show what you are actually trying to do?
You can get the plot bounds of a graph or chart using a property node. Look for "X-scale...range...minimum|maximum", same for Y.
Sorry, your VI makes absolutely no sense. First you slowly generate chart data, then you write it to a file, read it back from a file, do some exceedingly elaborate while loop that could be done with almost no code at all, then chart all data at once again. The stop button in the while loop makes no sense, because the while loop executes so fast that it is not possible to actually stop it while it is running, only if the button has already been pressed during the first FOR loop.
What is the purpose of the two arrays? They don't seem to serve any purpose. Why are you getting the array size with every iteration of the loop? Once, right before the loop should be enough. Index array is resizable, so only one instance is enough. Instead, array to cluster is probably all you need.
The sequence structure is only needed because you write, and then immediately read from the file. All you probably need is to write to the file and wire the 2D array to the seconds structure. Now we have a data dependency and the sequence structure is no longer needed.
Can you tell us a little more how you are zooming. Do you want to zoom any of the two graphs and automatically zoom the other accordingly?
As it currently stands, only the first chart gets data, so zooming the other one seems useless. Once the second chart has data, the VI stops and you can't do much either programmatically. Please explain how you are zooming.
Here is code (bottom of image) you could substitute for the while loop. Simpler? Yes. Still useless? Maybe.
(Don't forget to set the cluster size).
Can you tell us a little more about the program logic and how it is supposed to be used? Doing the linked zoom needs to be done in an independent loop, whenever one of the scales change.
