Easy question comparing strings

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JP
JP 2013-6-26
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

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采纳的回答

Tom
Tom 2013-6-26
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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