matlab ~ischar

`~ischar` is a logical operator in MATLAB which checks if the input is not a character array. It returns a logical value of `true` if the input is not a character array and `false` if the input is a character array.

For example, if we have a variable `str` and we want to check if it is not a character array, we can use the `~ischar` operator as follows:

str = 123;
if ~ischar(str)
   disp('The input is not a character array');
end

This code will print the message "The input is not a character array" because `str` is not a character array.