Number and alphabet

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john
john 2012-5-7
Hi,
I have edittext and pushbutton.
If I write with "sym(' ')" for example a1 or R2 or alfa34...matlab works good. If I write any text in this format a1 into edittext, then I want to enable pushbutton.
But if the firts is number for example 1a or 45R or 89gama, then matlab generate error. So if I write any text in this format 2a into edittext, then I want to disable pushbutton.
Please, how Can I do this?
Thank you
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john
john 2012-5-7
Yes, I understand...but I need avoid, that somebody will insert variables which start from a number.
John D'Errico
John D'Errico 2012-5-7
Use a regular expression to test for this event.

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回答（1 个）

Titus Edelhofer
Titus Edelhofer 2012-5-7
Hi,
you can use isvarname for this purpose, something like
str = get(handles.edit1, 'string');
if isvarname(str))
set(handles.pushbutton1, 'enable', 'on')
else
set(handles.pushbutton1, 'enable', 'off')
end
Titus
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john
john 2012-5-17
I think, that command "~isvarname(string) || isnan(str2double(string))" doesn't work. Do you have any Idea?
,
,
if ~isvarname(string) || isnan(str2double(string))
set(handles.pushbutton1,'enable','off');
else
set(handles.pushbutton1,'enable','on');
end;
Walter Roberson
Walter Roberson 2012-5-17
What difficulties are you encountering?

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