Determine if input is logical array
tf = islogical(A)
tf = islogical(A) returns true if A is
a logical array and false otherwise. islogical also
returns true if A is an instance
of a class that is derived from the logical class.
These examples show the values islogical returns
when passed specific types:
% Relational operators return logical values islogical(5<7) ans = 1 % true and false return logical values islogical(true) & islogical(false) ans = 1 % Constants are double-precision by default islogical(1) ans = 0 % logical creates logical values islogical(logical(1)) ans = 1