matlab GUI的例子，个个都是经典，大家都下载来学习-All of the handles to the various objects created in each GUI, as well as

　data needed to run the GUI, are stored in a main structure called S.　

　The fieldnames for handles are in lower case letters, and the fieldnames

　for data are in uppercase letters.　Callback function names are　

　designated with the fieldname of the object to which they correspond,　

　followed by　_call.　 Other function names are similarly designated.　For　

　instance, a keypressfcn will end in　_kpfcn　and a buttondownfcn will end　

　in　_bdfcn.　 The code of each GUI is generously commented, and subtle

　points may be examined in the comments (see for example the last comment

　block in GUI_32).　If anything seems unclear, look first in the comments,

　and if satisfaction is not found there feel free to email me.