MATLAB: Easy question comparing strings

strings

Hello I have the following code which doesn't work. The problem is Im trying to compare the value "NaN" which I guess isnt a string?…to the value of X. Let me know how to fix it thanks!
 str = input('Please enter a number \n\n','s'); 
 X = str2double(str);
 test=strcmp(X,'NaN');
 if test == 1
    disp('That was not a valid number');
 else
    disp('Here is your number')
    disp(X)
 end

Best Answer

You can just ISNAN instead:
 str = input('Please enter a number \n\n','s'); 
 X = str2double(str);
 if isnan(X)
    disp('That was not a valid number');
 else
    disp('Here is your number')
    disp(X)
 end
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