App Designer - "is already defined as a property"

In the properties section of my App Designer code I'm trying to create an array of zeros using the 'zeros()' method and then set a value of that array to a value. However, for some reason this is not allowed?

Code:

x = zeros(3, 1, 8);
x(1, 1, 1) = 0;

If I hover over 'x(1, 1, 1)' I get the error message "The current use of 'x' is inconsistent with its previous use or definition" and at runtime I get the error "'x' is already defined as a property".

Answer 1

[Walter Roberson]

Yes, there is a reason ;-)

The properties section is not pure executable code. Each statement of the property section defines an additional variable, with an optional initialization.

You have some options:

• you can construct an expression that returns an appropriate 3D array, using cat(3) and zeros()
• you can define a static method or a private/ function that returns the appropriate value and call the method or function in the initialization section
• you can leave the value uninitialized there, but initialize it in the constructor function