isequal — objects comparison
t=isequal(a,b) t=isequal(a,b,..)
 isequal compares its arguments. If all of them
    are equals function returns  %t and in the other case
    it returns  %f .
When comparing list's, structures,... the comparison is made recursively, the order of the fields matters.
floating point data are compared according to IEEE rule, i.e. NaN values are not equal. See isequalbitwise for bitwise comparisons.