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Hefaestion
Hefaestion

Reputation: 203

Equivalent of enumerated type in Matlab

I would like to define a data type in Matlab that can be 1 of 3 possible values. If I were doing this in C I would do the following:

typedef enum
{
    TYPE1,
    TYPE2,
    TYPE3,
} new_type_t;

new_type_t variable = TYPE1;

How can I achieve something similar in Matlab?

Ideally I want to have a Matlab class with a property that is restricted to some enumerated type.

My attempt at the Matlab code:

classdef Node
    classdef BoundaryTypes
        enumeration
            adiabatic
            convective
            conductive
        end
    end
    properties
        k
        c_p
        rho
        BC %type of boundary condition
    end

end

Upvotes: 0

Views: 377

Answers (2)

Sam Roberts
Sam Roberts

Reputation: 24147

You would start by defining an enumeration class for your boundary types:

classdef BoundaryConditionType
    enumeration
        adiabatic
        convective
        conductive
    end
end

Then you would construct your node class:

classdef Node
    properties
        k
        c_p
        rho
        BC
    end
end

If you wish to restrict the class of BC, there are two ways. The first will only work in R2016a onwards:

classdef Node
    properties
        k
        c_p
        rho
        BC BoundaryType
    end
end

If you're using an older version, you can implement a set method that will restrict the class of the property:

classdef Node
    properties
        k
        c_p
        rho
        BC
    end
    methods
        function obj = set.BC(obj, val)
            assert(isa(val,'BoundaryConditionType'))
            obj.BC = val;
        end
    end
end

Upvotes: 1

Dennis Jaheruddin
Dennis Jaheruddin

Reputation: 21561

As explained in the documentation, you can define an enumerator class.

classdef WeekDays
   enumeration
      Monday, Tuesday, Wednesday, Thursday, Friday
   end
end

Upvotes: 2

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