How to know if exist an field into a struct?

I want a funtion which give me "0" if dosen't exist a field into a struct and "1" if it exist, something like that:

s=struct("field1",val1,"field2",val2,"field3",val3);

exist(s.field1)
=1
exist(s.field5)
=0

Answer 1

[Steven Lord]

Take a look at isfield.

[jon]

It works perfect Thanks