LabVIEW
waveform graph problem
Solved!
@dineshmeena wrote:
hi,
i need to display a 16 channel in single graph with channel vs channel 2 or Channel 3 vs channel 6 like any channel vs any channel as x and y plot and user should select which plot sould be seen anybody have idea for this
Presumably at the moment you have sets of 1D arrays of data values. Place these into a cluster then an array, such that you have a 1D array of clusters of arrays of doubles (or whatever representation).
When you choose the sets to plot, index your array with the two values chosen to get two clusters each containing a 1D array of points. Then unbundle and bundle the two together to form one cluster with 2 1D arrays. Wire this to an X-Y graph.
here is a quick example .. uses the event structure.. not perfect but gives an idea
you have to change the tones and then the plots to see values on the XY Graph
Uses property nodes to change/update plotnames and the selection text ring etc.
EDIT: Updated the vi, the XY names are now generated ... hope I didn't do all the homework during my coffeebreak 😄
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I'm writing here in response to a PM and the most recent posts to this thread.
I'm not sure what you're looking for in your image that Henrik's solution doesn't provide. His solution is very similar to my earlier suggestion - form an array of arrays (Henrik used an array of waveforms generated by the Basic Signal Generator) and then index them, and bundle to form a valid input for an XY Graph.
What parts of his solution didn't work for you? Can you be more specific as to what you wanted that his solution didn't provide - it seems to me like all of the things you wanted are included in his code.
You should in particular pay attention to the part in the 'plots: Value Change' case, where the lower graph is updated (XY Graph). There, you can see the automatic indexing of his Plots input - your case will only have one pair, so you don't need a For loop in the simplest case, followed by explicit indexing of the array of waveforms (the brown wire, passed into the for loop from above). He uses the values of the X and Y arrays (you'll just have single X and Y values) to pick out two individual waveforms, then after forming a Plot Label using waveform attributes; these are like a collection of meta-data you can attach to a waveform - you can see him doing this in the first case, '"tones", "sampling info": Value Change'.
After that he takes only the Y component of the waveform (i.e. the data values - the other parts of a waveform are t0 and dt) using Get Waveform Components and uses the Bundle node to place them in a cluster. This is then wired (using autoindexing in his application - no need to worry about that in yours if you don't use a For loop) to the XY Graph directly.
