It seems like all the properties other than b and h should be dependent. This would allow you to get rid of the update method. If you really want to go the update route, you could write a set method for b and h which will call the update method.
Does the following work for you?
classdef form<handle
properties
type = 'square'
b
h
end
properties (Dependent)
A
Iy
Iz
Wy
Wz
end %properties
methods
function f = form(b,h)
f.b=b;
f.h=h;
end
function val = get.A(obj)
val= obj.h*obj.b;
end
function val = get.Iy(obj)
val= obj.h^3*obj.b/12;
end
function val = get.Iz(obj)
val= obj.b^3*obj.h/12;
end
function val = get.Wy(obj)
val= obj.h^2*obj.b/6;
end
function val = get.Wz(obj)
val = obj.b^2*obj.h/6;
end
end % events
end%class
You could also go with the "ugly" update method:
classdef form<handle
properties
type = 'square'
b
h
A
Iy
Iz
Wy
Wz
end %properties
methods
function f = form(b,h)
f.b=b;
f.h=h;
end
function set.b(obj, val)
obj.b = val;
obj.update;
end
function set.h(obj, val)
obj.h = val;
obj.update;
end
function obj = update(obj)
obj.A= obj.h*obj.b;
obj.Iy= obj.h^3*obj.b/12;
obj.Iz= obj.b^3*obj.h/12;
obj.Wy= obj.h^2*obj.b/6;
obj.Wz= obj.b^2*obj.h/6;
end
end % events
end%class
