How to check if the input it´s a string?

Hi, i´m trying to understand why when the user inputs for example: b, or fbr3f, or any other types of string, it´s giving me error message on Matlab, when I´m using the isstring function and isnumeric too, i´m using the isnumeric in case the user inputs whatever it´s not numeric~, and don´t know if its necessary since I´m using the isstring.

Please help me! Thanks a lot

The isempty works just fine!

clc, clear, close



b1= input('Press number 1 or 2:  ');

while  (isempty(b1) || isstring(b1) || ~isnumeric(b1))
disp ('Error')
b1= input('Press number 1 or 2');
end

%when the user writes any string appears:
% Error using input
%Unrecognized function or variable ....
%and i really don´t understand why...

Answer 1

[MJFcoNaN]

Hello,

you may need the 's' option to avoid evaluating text:

b1= input('Press number 1 or 2:  ','s');

[Madalena Francisco]

Ohhhh thank uu!! It works!!