[xs1119]

刚开始，我是这么做的，可是，老是出现

Error in ==> abc>pushbutton1_Callback at 127
a=str2num(get(handles.a,'String'))

Error in ==> gui_mainfcn at 75
feval(varargin{1:2});

这样的错误，后来，我把gui初始化中的

if nargin && ischar(varargin{1})
gui_State.gui_Callback = str2func(varargin{1});
end

if nargout
[varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
else
gui_mainfcn(gui_State, varargin{:});
end

替换成

if nargin == 0 % LAUNCH GUI
fig = openfig(mfilename,'reuse');


set(fig,'Color',get(0,'defaultUicontrolBackgroundColor'));


handles = guihandles(fig);

guidata(fig, handles);

if nargout > 0
varargout{1} = fig;
end

elseif ischar(varargin{1}) % INVOKE NAMED SUBFUNCTION OR CALLBACK
try
if (nargout)
[varargout{1:nargout}] = feval(varargin{:}); % FEVAL switchyard
else
feval(varargin{:}); % FEVAL switchyard
end
catch
disp(lasterr);
end
end

这个错误就不出现了，但是我不知道为什么？还望指点:lovely: :lovely: