How to define a constant using another in the Matlab class

Question

I can’t understand how to do such a simple thing as determining constants using others.

For example, a dummy example:

classdef DummyClass < handle
    properties (Constant)
        NB_SECONDS_IN_MINUTE = 60;
        NB_MINUTES_IN_HOUR   = 60;

        NB_SECONDS_IN_HOUR   = NB_SECONDS_IN_MINUTE * NB_MINUTES_IN_HOUR;
    end
end

This does not work: (

Then I tried with this line:

NB_SECONDS_IN_HOUR   = DummyClass.NB_SECONDS_IN_MINUTE * DummyClass.NB_MINUTES_IN_HOUR;

but that doesn't work either ...

Did someone understand the key?: /

(I am using MATLAB R2009a, btw)

Answer 1

You definitely need to refer to constants with the full class name, as in the second case. Is the DummyClasspackage directory ( +packagename)? If so, you need to use the full name, i.e.

NB_SECONDS_IN_HOUR = packagename.DummyClass.NB_SECONDS_IN_MINUTE * packagename.DummyClass.NB_SECONDS_IN_HOUR;

EDIT: just test this in R2009a:

>> ver matlab
-------------------------------------------------------------------------------------
[...]
-------------------------------------------------------------------------------------
MATLAB                                                Version 7.8        (R2009a)
>> type DummyClass

classdef DummyClass < handle
    properties (Constant)
        NB_SECONDS_IN_MINUTE = 60;
        NB_MINUTES_IN_HOUR   = 60;

        NB_SECONDS_IN_HOUR   = DummyClass.NB_SECONDS_IN_MINUTE * DummyClass.NB_MINUTES_IN_HOUR;
    end
end

>> DummyClass.NB_SECONDS_IN_HOUR
ans =
        3600