Reference to nonexistent field 'xdot1'.

I'm trying to create a GUI and want to input values and have the GUI plot a graph based on these values. Under the callback function for edit1 to edit4 I have the same code but the x1 after handles is x1, xdot1, x2 and xdot2, respectively. When I try to run it and put the values into my GUI, I keep getting the error "Reference to nonexistent variable 'xdot1'. Is there a way to eliminate this error so the GUi creates a graph?

This is my GUI:

This is the graph I am trying to create:

Answer 1

[Walter Roberson]

In your OpenFcn initialize the edit field String properties, and initialize the handles.* values appropriately.

Alternatively, do not bother with the edit callbacks unless you want to do input validation. Instead, retrieve the values from the edit fields right in your calculation function.