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Problem with properties in App Designer.

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New
New 2017-7-28
评论： Steven Lord 2017-7-29
Hello. I need help with "properties" in App Designer. I have some trouble with realization the method of symmetrical components.
properties (Access = public)
a = -.5 + sqrt (3) / 2 * j; % Phase-shift operator
     F = [1 a^2 a; 1 a a^2; 1 1 1]; % Matrix Fortescue
end
Message: "Invalid default value for property 'F' in class 'App1': Undefined function or variable 'a'."
If I replace "a" with "app.a" in the Matrix Fortescue.
Message: "Invalid default value for property 'F' in class 'App1': Undefined variable "app" or class "app.a"."

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回答（1 个）

Steven Lord
Steven Lord 2017-7-28
Since you're probably not going to want a and F to change based on the state of your app, make them Constant properties, properties with the Constant attribute.
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New
New 2017-7-29
编辑：New 2017-7-29
No, prefix does not depend on the name of the application or classname.
Steven Lord
Steven Lord 2017-7-29
That is correct IF you're referring to a property of an instance of the class. A Constant property can be accessed even if you don't have an instance of the class, and the way you do that is by using the name of the class.

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