What value have a variable 'edit text' guide

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Sergio
Sergio 2012-5-16
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

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采纳的回答

Geoff
Geoff 2012-5-16
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.

更多回答（1 个）

Walter Roberson
Walter Roberson 2012-5-16
T = str2double(get(handles.TM, 'string'));
if isnan(T); T = 0.001; end;
Notice str2double() instead of str2num(): this is more secure and more predictable.

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