Are you using App Designer or GUIDE? What version are you on?
If using App Designer, use the Edit Field (Numeric). If using GUIDE, have your callback function validate the input first. This can be done with a regular expression.
I'm not sure what behavior you want, but this will return any non-numeric character:
rmv = regexp(edit,'[^0-9]','match')
while this will return the numeric characters:
nums = regexp(edit,'\d*','match')
If you wanted to just remove any non-numeric character and leave the rest, you could do this:
function edit1_Callback(hObject, eventdata, handles)
...
edit=get(hObject,'string');
rmv = regexp(edit,'[^0-9]','match');
rmv = unique(rmv{:});
for loop = 1:length(rmv)
edit = strrep(edit,rmv(loop),'');
end
set(hObject,'String',edit);
Just note that this will remove a period in decimal numbers as well. If you do intend to keep it, update your regexp to
rmv = regexp(edit,'[^0-9\.]','match');
