MATLAB: Get information of property type of object properties (i.e. ‘dependent’)

dependent propertiesobject

Hello,

I often use a subfunction to compare if two objects are equal. This subfunction simply compares every property for same numbers, strings and so on. My objects have some dependent properties which need a lot of time to be calculated. It would not be necessary to compare the dependent properties to see if objects are equal.

Is there a possibility to find out, if properties are "real" properties before accessing them?

Thaks for any help!

Staffan

Best Answer

You can use meta class and access PropertyList

http://www.mathworks.com/help/techdoc/ref/meta.class.html

http://www.mathworks.com/help/techdoc/ref/meta.property.html

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MATLAB: Correct way to specify default property values when constructor uses inputParser.

The default values of properties in the properties block are assigned once when the first object is created . Subsequent objects get the same values. This has important consequences when the value is an object of a handle class. One must distinguish between the underlying object and it's handle. See the descriptions in the documentation:

You are not the only one who has been puzzled by this behaviour. See Handle object as default class property value. (The current documentation is better than that refered to in this blog-post.)

I recommend that you use your Method 2 when the value is an object of a handle class. Method 1 will make the property in question of all objects refer to the same underlying "handle object".

Added later: An answer by MathWorks Support Team When I have nested objects, changing the parameter of one object changes the same parameter in others

MATLAB: Is there a difference between declaring a class property “Dependent” versus “Dependent = true”

Yes, they are equivalent. Also, you can do,

properties(~Dependent)
    aProp
end

as an equivalent to,

properties(Dependent=false)
    aProp
end

Best Answer

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MATLAB: Correct way to specify default property values when constructor uses inputParser.

MATLAB: Is there a difference between declaring a class property “Dependent” versus “Dependent = true”

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