Reference to nonexistent field 'xdot1'.

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Jett Tom
Jett Tom 2021-5-1
回答： Walter Roberson 2021-5-1
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:

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回答（1 个）

Walter Roberson
Walter Roberson 2021-5-1
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.

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