求救 关于handles的问题
 

下面是我找的一个程序代码：
[fname,pname,filterindex]=uigetfile('*.*','All Files (*.*)');
set(handles.text_filename,'String',filename);
fid=fopen(filename,'r');
if fid==-1
warndlg('Can not open the file','WARN');
fclose(fid);
end
[citymat,COUNT]=fscanf(fid,' %g');
cN=COUNT/3;
set(handles.edit_citysum,'String',cN);
fclose(fid);
aN=str2double(get(handles.edit_antsum,'String'));
ncmax=str2double(get(handles.edit_ncmax,'String'));
for nc=1:ncmax
for k=1:aN
g(nc,k)=fix((aN-1)*rand(1))+1;
end
end
运行结果如下：
??? Undefined function or variable 'handles'.

Error in ==> ceshi0 at 2
set(handles.text_filename,'String',filename);
能不能帮我看看这是为什么。