Scatter Plot Problem!!

[yskpark]

Hello everyone,

I am quite new at Labview and I have a question regarding plotting 2d-array in a scatter plot.

I would like to plot my data as a scatter plot, which I have done with the Waveform graph, and now I would like to find out the area with the highest density in the scatter plot

and mark the area with a circle...is it possible in Labview to realize this?? I would be very thankful for every tips!

Thank You

Best Regards 

Yun

[Hooovahh]

Yes it is possible.  You said you are using a waveform graph, wouldn't an XY graph be a better choice?  I don't know the data you are getting so a waveform graph might be the right tool here.

In either case you'll need to define a length of X that you want to find the denses amount of points.  So say X=1 so then you will find all the points between 0 and 1 and count them, then 0.1 to 1.1 and count them, then 0.2 to 1.2 for the length of X on your graph.  Doing this in a For loop will make it easy, and then your output will be an array of counts for each section.  Find the maximum using the Array Max & Min function.  

Then you can highlight the graph using property nodes.  You can use a cursor, or annotation, or a custom picture.  The easiest would probably be an Annotation and in the Example finder there is one called "Graph Annotations" that find the minimum, maximum, and average values for a graph and put an overlay on the graph.

[yskpark]

@Hoovaah

First of all thank you for your tip! but could you please explain me a little bit more explicit  how I can count the amount of dense in a For Loop?? Do you have any example so I can get some idea? It would be very helpful!

Thank you

Best Regards

Yun

[Hooovahh]

Here's a quick exqample saved in 2011 that I think shows the basics.  It has several bugs you will need to figure out.  Like right now this only works if the graph is in the upper left hand corner, I couldn't figure out how to find the offset needed based on the graph position.