Hello! I am creating a program that allows you to plot multiple graphs on the same graph. I created a subVI that allows you to select the measurement range between two Y points and then create a new graph. I encounter a problem when I create a reference of my graph, I cannot connect it with my subVi. Thank you for your support.

Most likely you created the reference before defining the datatype of the xy graph and now the datatype differs. (XY graphs can have many datatypes (complex, cluster, points, etc.) and only after connecting the data to the terminal it will be defined. You need to change the control reference. If you get the "value" in your subVI, you can see that it is a single cluster of xy arrays instead of an array of such clusters. See if this can give you some ideas. I took the liberty to simplify a few things. Of course you probably want to expand it so the second graph adjust whenever the cursors change, by creating a proper state machine.

We are missing the toplevel (project.vi).

Please use "save for previous" (2020 or below) before attaching. I currently cannot look at your VIs. From the "capture" image, you have giant race conditions due to blatant overuse of local variables. All your local variables will get read way before their indicators have received data, so the outcome is completely unpredictable. You can easily eliminate ALL locals by just branching the wires, guaranteeing that the execution order is correct. Why are there terminals without labels and so (so!) many wire bends and hidden wires? Clean code would be much easier to handle. I cannot tell from the image alone what the problem with the reference is.

LabVIEW

Graph multiple plot curseur

Solved!

Solution

Accepted by topic author

One problem is that if you would just remove the outside points, the graph will connect the edge points. If you want gaps, you should use a plot style that has no interpolation.