function?entro?=?entro_calculated（x）
????%?%?calculate?the?entropy
????Elem_x?=?unique（x）;?%?find?all?possible?elements?of?Y
????num_x?=?length（Elem_x）;?%?the?number?of?possible?cases?of?Y
????denominator?=?length（x）;
????prob?=?zeros（num_x1）;
????Info?=?zeros（num_x1）;
????for?i?=?1:num_x
????????index?=?（x?==?Elem_x（i））;
????????prob（i）?=?sum（index）/denominator;
????????Info（i）?=?prob（i）*log（prob（i））;
????end

????entro?=?-sum（prob.*Info）/log（2）;?%?unified?as?bit
end

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件??????15777??2014-03-12?16:25??balance_scale.png

?????文件???????6250??2014-03-07?20:00??balance-scale.data

?????文件???????2222??2014-03-07?20:00??balance-scale.names

?????文件???????5089??2014-03-12?16:41??balloon.png

?????文件????????160??2014-03-11?22:58??balloons.data

?????文件???????1104??2014-03-07?19:59??balloons.names

?????文件????????493??2014-03-05?20:20??E_category.m

?????文件????????488??2014-03-05?16:21??entro_calculated.m

?????文件????????254??2014-03-12?16:26??GolfPlay.mat

?????文件???????4388??2014-03-12?16:27??GolfPlay.png

?????文件????????447??2014-03-12?16:11??ID3_tree.m

?????文件????????408??2014-03-07?20:06??lenses.data

?????文件???????1644??2014-03-07?20:06??lenses.names

?????文件???????5222??2014-03-12?16:45??lenses.png

?????文件????????123??2014-03-12?15:37??preproc_balance_scale.asv

?????文件????????192??2014-03-12?16:11??preproc_balance_scale.m

?????文件????????226??2014-03-12?16:40??preproc_balloons.m

?????文件?????????62??2014-03-12?16:27??preproc_GolfPlay.m

?????文件?????????83??2014-03-12?16:32??preproc_lenses.m

?????文件???????2113??2014-03-12?00:45??recurrent_step.asv

?????文件???????2119??2014-03-12?00:46??recurrent_step.m

-----------?---------??----------?-----??----

????????????????48864????????????????????21