function?[test_targets?E]?=?ada_boost（train_patterns?train_targets?test_patterns?params）

%?Classify?using?the?AdaBoost?algorithm
%?Inputs:
%?	train_patterns	-?Train?patterns
%	train_targets	-?Train?targets
%???test_patterns???-?Test??patterns
%	Params	-?[NumberOfIterations?Weak?Learner?Type?Learner‘s?parameters]
%
%?Outputs
%	test_targets	-?Predicted?targets
%???E???????????????-?Errors?through?the?iterations
%
%?NOTE:?Suitable?for?only?two?classes
%

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

[NiM]			=?size（train_patterns）;
W			?	=?ones（1M）/M;
IterDisp		=?10;

full_patterns???=?[train_patterns?test_patterns];
test_targets????=?zeros（1?size（test_patterns2））;

%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_patterns（:?indices）?train_targets（indices）?full_patterns?alg_param）;

???%Ek?<-?Training?error?of?Ck?
???E（k）?=?sum（W.*（Ck（1:M）?~=?train_targets））;
???
???if?（E（k）?==?0）
??????break
???end
???
???%alpha_k?<-?1/2*ln（1-Ek）/Ek）
???alpha_k?=?0.5*log（（1-E（k））/E（k））;
???
???%W_k+1?=?W_k/Z*exp（+/-alpha）
???W??=?W.*exp（alpha_k*（xor（Ck（1:M）train_targets）*2-1））;
???W??=?W./sum（W）;
???
???%Update?the?test?targets
???test_targets??=?test_targets?+?alpha_k*（2*Ck（M+1:end）-1）;
???
???if?（k/IterDisp?==?floor（k/IterDisp））
??????disp（[‘Completed?‘?num2str（k）?‘?boosting?iterations‘]）
???end
???
end

test_targets?=?test_targets?>?0;

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

?????文件?????952782??2002-05-20?08:36??PR\About.bmp

?????文件???????1892??2003-06-26?20:48??PR\Ada_Boost.m

?????文件???????2815??2003-06-10?20:38??PR\ADDC.m

?????文件???????4439??2003-08-31?20:47??PR\AGHC.m

?????文件???????3397??2003-06-26?21:06??PR\Backpropagation_Batch.m

?????文件???????5308??2003-06-26?21:06??PR\Backpropagation_CGD.m

?????文件???????6494??2003-02-22?20:26??PR\Backpropagation_Quickprop.m

?????文件???????5029??2003-02-22?20:42??PR\Backpropagation_Recurrent.m

?????文件???????3334??2003-02-22?20:46??PR\Backpropagation_SM.m

?????文件???????3117??2003-02-22?20:50??PR\Backpropagation_Stochastic.m

?????文件???????1421??2003-03-05?19:07??PR\Balanced_Winnow.m

?????文件???????3343??2003-04-02?20:27??PR\Bayesian_Model_Comparison.m

?????文件????????588??2001-12-27?09:56??PR\Bhattacharyya.m

?????文件???????3248??2003-03-09?22:07??PR\BIMSEC.m

?????文件???????5599??2003-06-10?20:37??PR\C4_5.m

?????文件????????905??2003-02-22?21:13??PR\calculate_error.m

?????文件????????756??2003-02-18?17:57??PR\calculate_region.m

?????文件???????3721??2003-11-06?22:06??PR\CART.m

?????文件????????846??2003-02-22?21:36??PR\CARTfunctions.m

?????文件???????5527??2003-02-22?21:45??PR\Cascade_Correlation.m

?????文件????????902??2001-12-27?10:15??PR\Chernoff.m

?????文件???????2745??2003-11-08?22:59??PR\Classification.txt

?????文件???????1995??2003-02-22?21:48??PR\classification_error.m

?????文件??????19454??2003-09-21?21:04??PR\classifier.m

?????文件???????4520??2003-03-04?20:47??PR\classifier.mat

?????文件??????26413??2004-07-18?20:28??PR\classifier_commands.m

?????文件???????2448??2004-07-18?20:21??PR\classify_paramteric.m

?????文件???????3507??2003-10-11?22:11??PR\click_points.m

?????文件????????753??2003-08-07?11:49??PR\combinations.m

?????文件???????2754??2003-03-09?22:09??PR\Competitive_learning.m

............此處省略151個文件信息