function?D?=?ada_boost（train_features?train_targets?params?region）;

%?Classify?using?the?AdaBoost?algorithm
%?Inputs:
%?	features	-?Train?features
%	targets	-?Train?targets
%	Params	-?[NumberOfIterations?Weak?Learner?Type?Learner‘s?parameters]
%	region	-?Decision?region?vector:?[-x?x?-y?y?number_of_points]
%
%?Outputs
%	D			-?Decision?sufrace
%
%?NOTE:?This?algorithm?is?very?tuned?to?the?2D?nature?of?the?toolbox!

[k_max?weak_learner?alg_param]?=?process_params（params）;

[NiM]			=?size（train_features）;
D			?		=?zeros（region（5））;
W			?		=?ones（1M）/M;
IterDisp			=?10;

%Find?where?the?training?features?fall?on?the?decision?grid
N???????????=?region（5）;
mx??????????=?ones（N1）?*?linspace?（region（1）region（2）N）;
my??????????=?linspace?（region（3）region（4）N）‘?*?ones（1N）;
flatxy??????=?[mx（:）?my（:）]‘;
train_loc	=?zeros（1M）;
for?i?=?1:M
???dist?=?sqrt（sum（（flatxy?-?train_features（:i）*ones（1N^2））.^2））;
???[m?train_loc（i）]?=?min（dist）;
end

%Do?the?AdaBoosting
for?k?=?1:k_max
???%Train?weak?learner?Ck?using?the?data?sampled?according?to?W:
???%...so?sample?the?data?according?to?W
???randnum?=?rand（1M）;
???cW	???=?cumsum（W）;
???indices?=?zeros（1M）;
???for?i?=?1:M
??????%Find?which?bin?the?random?number?falls?into
??????loc?=?max（find（randnum（i）?>?cW））+1;
??????if?isempty（loc）
?????????indices（i）?=?1;
??????else
?????????indices（i）?=?loc;
??????end
???end
???
???%...and?now?train?the?classifier
???Ck?	=?feval（weak_learner?train_features（:?indices）?train_targets（indices）?alg_param?region）;
???Ckl?	=?Ck（:）;
???
???%Ek?<-?Training?error?of?Ck?
???Ek?=?sum（W.*（Ckl（train_loc）‘?~=?train_targets））;
???
???if?（Ek?==?0）
??????break
???end
???
???%alpha_k?<-?1/2*ln（1-Ek）/Ek）
???alpha_k?=?0.5*log（（1-Ek）/Ek）;
???
???%W_k+1?=?W_k/Z*exp（+/-alpha）
???W??=?W.*exp（alpha_k*（xor（Ckl（train_loc）‘train_targets）*2-1））;
???W??=?W./sum（W）;
???
???%Update?the?decision?region
???D??=?D?+?alpha_k*（2*Ck-1）;
???
???if?（k/IterDisp?==?floor（k/IterDisp））
??????disp（[‘Completed?‘?num2str（k）?‘?boosting?iterations‘]）
???end
???
end

D?=?D>0;

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

?????文件??????34256??2006-03-28?23:17??Classification?MatLab?Toolbox\spiral.mat

?????文件???????3004??2006-03-28?22:57??Classification?MatLab?Toolbox\ADDC.m

?????文件???????4318??2006-03-28?22:57??Classification?MatLab?Toolbox\AGHC.m

?????文件???????2704??2006-03-28?23:16??Classification?MatLab?Toolbox\load_file.m

?????文件?????952782??2006-03-28?22:57??Classification?MatLab?Toolbox\About.bmp

?????文件????????294??2006-03-28?23:16??Classification?MatLab?Toolbox\make_a_draw.m

?????文件???????2137??2006-03-28?22:58??Classification?MatLab?Toolbox\Ada_Boost.m

?????文件???????3298??2006-03-28?22:58??Classification?MatLab?Toolbox\BIMSEC.m

?????文件???????4110??2006-03-28?23:14??Classification?MatLab?Toolbox\feature_selection.m

?????文件???????3266??2006-03-28?22:58??Classification?MatLab?Toolbox\Backpropagation_Batch.m

?????文件???????1720??2006-03-28?23:15??Classification?MatLab?Toolbox\feature_selection.mat

?????文件???????5183??2006-03-28?22:59??Classification?MatLab?Toolbox\Backpropagation_CGD.m

?????文件???????5934??2006-03-28?23:14??Classification?MatLab?Toolbox\enter_distributions_commands.m

?????文件???????6448??2006-03-28?22:59??Classification?MatLab?Toolbox\Backpropagation_Quickprop.m

?????文件???????1835??2006-03-28?23:15??Classification?MatLab?Toolbox\feature_selection_commands.m

?????文件???????4963??2006-03-28?22:59??Classification?MatLab?Toolbox\Backpropagation_Recurrent.m

?????文件????????172??2006-03-28?23:15??Classification?MatLab?Toolbox\find_classes.m

?????文件???????3216??2006-03-28?22:59??Classification?MatLab?Toolbox\Backpropagation_SM.m

?????文件???????1830??2006-03-28?23:15??Classification?MatLab?Toolbox\fuzzy_k_means.m

?????文件???????2986??2006-03-28?22:59??Classification?MatLab?Toolbox\Backpropagation_Stochastic.m

?????文件???????2622??2006-03-28?23:15??Classification?MatLab?Toolbox\generate_data_set.m

?????文件???????1377??2006-03-28?22:59??Classification?MatLab?Toolbox\Balanced_Winnow.m

?????文件???????2280??2006-03-28?23:15??Classification?MatLab?Toolbox\high_histogram.m

?????文件???????3248??2006-03-28?23:00??Classification?MatLab?Toolbox\Bayesian_Model_Comparison.m

?????文件????????435??2006-03-28?23:16??Classification?MatLab?Toolbox\loglikelihood.m

?????文件????????588??2006-03-28?23:00??Classification?MatLab?Toolbox\Bhattacharyya.m

?????文件???????5984??2006-03-28?23:00??Classification?MatLab?Toolbox\C4_5.m

?????文件???????4104??2006-03-28?23:00??Classification?MatLab?Toolbox\CART.m

?????文件???????3842??2006-03-28?23:16??Classification?MatLab?Toolbox\min_spanning_tree.m

?????文件????????846??2006-03-28?23:00??Classification?MatLab?Toolbox\CARTfunctions.m

............此處省略135個文件信息