Why does ISFIELD always return FALSE when querying a user-defined class in MATLAB 7.7 (R2008b)?

Question

MathWorks Support Team 2009-6-27

When I use the function ISFIELD on a MATLAB class object, it always returns false, even when I know that the queried property is there.

The class definition includes a property called 'myproperty'

classdef myclass
      properties
          myproperty = 0;
      end
end

When I check the presence of a property as follows:

x=myclass
isfield(x,'myproperty')

ISFIELD always returns a FALSE

 ans =
       0

Answer 1

Using ISFIELD on a user defined MATLAB class is not supported in MATLAB 7.7 (R2008b).

As a workaround, use the following to determine if a property exists for a class:

any(strcmp(properties(x), 'myproperty'))