When you use isa, MATLAB returns true if the class name of the first input argument is either the specified class, or a subclass of the specified class. When you use strcmp, MATLAB returns true only if the input arguments match, and therefore subclasses are not considered a match.

If you want a comparison to return true only if the input arguments match, leave your code as is.

If you want a comparison to return true if the class of the first input argument matches, or is a subclass of the specified class, use isa.

For example, change code such as this,

strcmp(class(x),'className');

to this:

isa(x,'className');