MATLAB: What value have a variable ‘edit text’ guide

edit text variable guide

What value have a variable 'edit text' in guide if the variable doesn't have any value in the interface……
T = str2num(get(handles.TM,'string'));
TM is a edit text in guide, but if TM doesn't have anything what value has? is for do the next:
T = str2num(get(handles.TM,'string'));
if T==[]
    T=0.001;
end
I put [] but doesn't work

Best Answer

No, you need to use isempty.
if isempty(T)
  T = 0.001;
end
Note that if you use str2double instead, you'll get NaN and can use isnan to test.
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