MATLAB: Using text in if/else statements

if statementparameter spacephase differencetext;

this is kind of a silly question. But I am trying to map the parameter space of a set of coupled oscillators storing the phase difference. However, for some parameter values obviously the coupling leads to chaotic behavior. I want to be able to mark those values
I have calculated the phase difference for different parameter values by take the mean of the difference of the values of the two oscillators, and I have stored this information in an array. However, I like to be able to add an if/else statement that would mark values that have a very high standard deviation (or some other condition that would show that the coupling behavior of the oscillators is chaotic for that parameter set). I was thinking of temporarily just having some std value above which the mean would not be stored in the array, but 'chaotic' would be stored. For example:
 if std(s([30:700],1)-s([30:700],2))>0.1;
            my_data(i,j)=display('chaotic');
        else
            my_data(i,j)=mean(s([30:700],2)-s([30:700],1))
end
However, this doesn't work. and obviously disp() doesn't work either. Eventually I would like to be able use a function like pcolor to map out parameter space. But I would want to be able to black out the portions that lead to chaotic coupling behavior.
Thanks!

Best Answer

 i=1,j=2             %you have to set i and j
s=rand(700,2);      % it's just an example to test a code
if std(s(30:700,1)-s(30:700,2))>0.1
            my_data{i,j}='chaotic';
        else
            my_data{i,j}=mean(s(30:700,2)-s(30:700,1) )
end
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