number of points in XY graph

[NIan1234]

Hi every one, I wanted to know if there was a property node to get the number of points displayed on a XY graph,

       how many points are plotted here??

And if zoom in, how many points are plotted as follows?

These images are taken from the "XY graph data types.vi", it is in the examples of LabVIEW.

[paul_cardinale]

The number of points can be found from the value; which you can get from the terminal, from a local variable, or from the Value property.

[NIan1234]

Maybe I did not explain myself well. What I meant was that I am running LabVIEW, I am seeing the graph, if I zoom in the graph, how can I know the number of points that are being plotted?

Thank you

[paul_cardinale]

The XY Graph doesn't indicate the number of points.  But it would be simple to add to the code so as to have a separate indicator for number of points.

[altenbach]

Do you want the number of points in the data or the number of points currently visible in the zooned area? You can get the x and y axis ranges from property nodes, then you would iterate over all points with a range check on x and y.

There are events for "scale range change". Use that to trigger your calculation.

The solution strongly depends on the datatype of the xy graph (complex, cluster of x and y arrays, array of xy points, etc. Single plot? Multiple plots? etc.)

Simplest would be to attach a small VI containing the xy graph and typical data and a description how you want to interact with the graph.

[altenbach]

Here is one simple possibility: