%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%?回溯搜索（BSA）進(jìn)行函數(shù)優(yōu)化，
%?輸入：popsize?種群個數(shù)，Dimsize?變量維數(shù)，pop=【pop1pop2...popi...popN】為種群集合，Maxgen?最大迭代次數(shù)，
%?lowerboundary?upperboundary分別為變量上下界，?
%?輸出:?globalminimizerglobalminimum
function?BSA（）
clc;
clear?all;
format?long;
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%??給定初始化條件??%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
popsize??=?10;?????????????????????????????????????????????????????????????%?種群數(shù)目
Dimsize??=??30;????????????????????????????????????????????????????????????%?變量維數(shù)
Maxgen??=??1000;???????????????????????????????????????????????????????????%?最大的迭代次數(shù)
mixrate?=?1;???????????????????????????????????????????????????????????????%?最大交叉概率
constant_F?=?3;
lowerboundary??=??-100.*ones（1Dimsize）?;?
upperboundary??=??100.*ones（1Dimsize）?;
globalminimum?=?Inf;
%%%%%%%%%%%%%%%%%%%%%%%%????????種群初始化??????????%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
for?i?=?1:popsize
????pop（?i:）?=?lowerboundary?+?rand（1Dimsize）?.*?（upperboundary?-?lowerboundary）;?????????????%?初始化種群
????oldpop（?i:）?=?lowerboundary?+?rand（1Dimsize）?.*?（upperboundary?-?lowerboundary）;???
????Fitpop（i）?=?fitness（?pop（i:）Dimsize?）;
end
%%%%%%%%%%%%%%%%%%%%%%%%%?????選擇第一階段?????????%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
for?t?=?1:Maxgen?
???for?i?=1:popsize
???????rand_a?=?rand;
???????rand_b?=?rand;
????if??rand_a?????????oldpop（i:）?=?pop（i:）;
????else
????????oldpop?=?oldpop（randperm（popsize）:）;
????????oldpop?=?oldpop（:randperm（Dimsize））;
????end
???end
??%%%%%%%%%%%%%%%%%%%%%?????????變異???????????????%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
??for?i?=?1:popsize??
??????trialpop（i:）?=?pop（i:）?+?constant_F?.*?randn?.*?（oldpop（i:）-pop（i:））;
??end
%%%%%%%%%%%%%%%%%%%%%?????????交叉??????????????%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
????integer_matrix?=?ones（popsizeDimsize）;
????rand_c?=?rand;
????rand_d?=?rand;
????if?rand_c????????number?=?ceil（mixrate?*?rand?*?Dimsize）;
???????sequence?=?randperm（Dimsize）;
???????for?i?=?1:popsize?
????????????for?u?=?1:number
????????????????j?=?sequence（u）;
????????????????integer_matrix（?ij?）?=?0;
????????????end
???????end
????else
????????sequence?=?randperm（Dimsize）;
????????for?i?=?1:popsize
????????????j?=?sequence（1）;
????????????integer_matrix（?ij?）?=?0;
????????end
????end
????for?i?=?1:popsize
????????for?j?=?1:Dimsize
????????????if??integer_matrix（?ij?）?==?1
????????????????trialpop（ij）?=?pop（ij）;
????????????end
????????end
????end
????%%%%%%%%%%%%%%%%%%%%??????邊界檢測??????????%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
????for?i?=?1:popsize
?????????for?j?=?1:Dimsize???????????????????????????????????????????????????

?屬性????????????大小?????日期????時間???名稱
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?????文件????????4490??2020-03-26?10:56??回溯搜索算法????matlab??BSA.m.m