【正文】
Y(目標(biāo)函數(shù)值) : FINAL(最優(yōu)解 )= 由圖可見(jiàn),遺傳代數(shù)增加,變異概率增加,全局最憂(yōu)解收斂性 最優(yōu) 。 (2) 交叉操作是產(chǎn)生新個(gè)體的主要方法一般應(yīng)取值較大,但太大會(huì)破壞群體的優(yōu)良模型,對(duì)進(jìn)化產(chǎn)生不利影響。得出遺傳算法不僅可求解簡(jiǎn)單函數(shù)最值問(wèn)題,而且可以?xún)?yōu)化許多復(fù)雜系統(tǒng)函數(shù)問(wèn)題,它提供了一種系統(tǒng)優(yōu)化函數(shù)的通用框架,它不依賴(lài)于問(wèn)題的具體領(lǐng)域,對(duì) 問(wèn)題的種類(lèi)具有很強(qiáng)的魯棒性,所以廣泛應(yīng)用于很多科學(xué)領(lǐng)域。 6 [2]《 MATLAB 語(yǔ)言》 /張陪強(qiáng) 主編 合肥中國(guó)科學(xué)技術(shù)出版社 1995 年 11 月 [3]《遺傳算法的基本理論與應(yīng)用》 /李敏強(qiáng) 寇紀(jì)淞 科學(xué)出版社 [4]《 MATLAB 語(yǔ)言及實(shí)踐教程》 /肖燕彩 清華大學(xué)出版社 2022 年 5 月 蘇州大學(xué) 自學(xué) 考試 畢業(yè)論文(設(shè)計(jì)) 29 附 錄 % f(x)=11*sin(6x)+7*cos(5x) x∈ [0,2*pi] % 主程序 %遺傳算法主程序 clear clf popsize=20。 %字符串長(zhǎng)度(個(gè)體長(zhǎng)度),染色體長(zhǎng)度 pc=。 %設(shè)置變異概率,同理也可設(shè)置為變化的 pop=initpop(popsize,chromlength)。%計(jì)算目標(biāo)函數(shù) fitvalue=calfitvalue(objvalue)。 %復(fù)制 [newpop]=crossover(pop,pc)。%變異 [bestindividual,bestfit]=best(pop,fitvalue)。 n(i)=i。 x(i)=decodechrom(pop5,1,chromlength)*10/1023。 end y(i) fplot(39。,[0 2*pi]) 蘇州大學(xué) 自學(xué) 考試 畢業(yè)論文(設(shè)計(jì)) 30 grid on hold on plot(x,y,39。) hold off % 初始化 (編碼 ) % 函數(shù)的功能是實(shí)現(xiàn)群體的初始化, popsize 表示群體的大小, chromlength 表示染色體的長(zhǎng)度 (二值數(shù)的長(zhǎng)度 ), % 長(zhǎng)度大小取決于變量的二進(jìn)制編碼的長(zhǎng)度 (在本例中取 8 位 )。 % rand 隨機(jī)產(chǎn)生每個(gè)單元為 {0,1} 行數(shù)為 popsize,列數(shù)為 chromlength 的矩陣, %roud 對(duì)矩陣的每個(gè)單元進(jìn)行圓整。 %求 pop 行和例數(shù) for i=1:py pop1(:,i)=2.^(py1).*pop(:,i)。 % 乘上權(quán)重 end pop2=sum(pop1,2)。本例為 1), % 參數(shù) 1ength 表示所截取的長(zhǎng)度(本例為 8)。 %將從第“ spoint”位開(kāi)始到第“ spoint+length1”位(這段碼位表示一個(gè)參數(shù))取出 pop2=decodebinary(pop1)。 %遺傳算法子程序 %實(shí)現(xiàn)目標(biāo)函數(shù)的計(jì)算 function [objvalue]=calobjvalue(pop) temp1=decodechrom(pop,1,8)。%將二值域 中的數(shù)轉(zhuǎn)化為變量域 的數(shù) objvalue=11*sin(6*x)+7*cos(5*x)。 Cmin=0。 for i=1:px 蘇州大學(xué) 自學(xué) 考試 畢業(yè)論文(設(shè)計(jì)) 32 if objvalue(i)+Cmin0 temp=Cmin+objvalue(i)。 end fitvalue(i)=temp。 % 選擇復(fù)制 % 選擇或復(fù)制操作是決定哪些個(gè)體可以進(jìn)入下一代。 % 根據(jù)方程 pi=fi/∑ fi=fi/fsum ,選擇步驟: % 1)在第 t 代,由( 1)式計(jì)算 fsum 和 pi % 2)產(chǎn)生 {0,1} 的隨機(jī)數(shù) rand( .),求 s=rand( .)*fsum % 3)求 ∑ fi≥ s 中最小的 k ,則第 k 個(gè)個(gè)體被選中 % 4)進(jìn)行 N 次 2)、 3)操作,得到 N 個(gè)個(gè)體,成為第 t=t+1 代種群 %遺傳算法子程 序 %選擇復(fù)制 function [newpop]=selection(pop,fitvalue) totalfit=sum(fitvalue)。%單個(gè)個(gè)體被選擇的概率 fitvalue=cumsum(fitvalue)。 ms=sort(rand(px,1))。 %fivalue 是一向量, fitin 代表向量中元素位,即 fitvalue(fitin)代表第 fitin 個(gè)個(gè)體的單個(gè)個(gè)體被選擇的概率 newin=1。 %賦值 ,即將舊種群中 的第 fitin 個(gè)個(gè)體保留到下一代(newpop) newin=newin+1。 end end % 交叉 % 交叉 (crossover),群體中的每個(gè)個(gè)體之間都以一定的概率 pc 交叉,即兩個(gè)個(gè)體從各自字符串的某一位置 % (一般是隨機(jī)確定)開(kāi)始互相交換,這類(lèi)似生物進(jìn)化過(guò)程中的基因分裂與重組。利用交又我們有可能由父代個(gè)體在子代組合成具有更高適合度的個(gè)體。 %遺傳算法子程序 %交叉 function [newpop]=crossover(pop,pc) [px,py]=size(pop)。 for i=1:2:px1 if(randpc) cpoint=round(rand*py)。 蘇州大學(xué) 自學(xué) 考試 畢業(yè)論文(設(shè)計(jì)) 34 newpop(i+1,:)=[pop(i+1,1:cpoint) pop(i,cpoint+1:py)]。 newpop(i+1,:)=pop(i+1,:)。變異是指父代中的每個(gè)個(gè)體的每一位都以概率 pm 翻轉(zhuǎn),即由“ 1”變?yōu)椤?0”, % 或由“ 0”變?yōu)椤?1”。 %遺傳算法子程序 %變異 function [newpop]=mutation(pop,pm) [px,py]=size(pop)。 for i=1:px if(randpm) %產(chǎn)生一隨機(jī)數(shù)與變異概率比較 mpoint=round(rand*py)。 end newpop(i,:)=pop(i,:)。 else newpop(i,mpoint)=0。 蘇州大學(xué) 自學(xué) 考試 畢業(yè)論文(設(shè)計(jì)) 35 end end % 求出群體中最大 的 適應(yīng)值及其個(gè)體 %遺傳算法子程序 %求出群體中適應(yīng)值最大的值 function [bestindividual,bestfit]=best(pop,fitvalue) [px,py]=size(pop)。 bestfit=fitvalue(1)。 bestfit=fitvalue(i)。 for j=1:py。 py=py1。 t=temp2*2*pi/1023。t agree with the disciplinary action your employer has taken against you ? your employer dismisses you and you think that you have been dismissed unfairly. 蘇州大學(xué) 自學(xué) 考試 畢業(yè)論文(設(shè)計(jì)) 36 For more information about dismissal and unfair dismissal, see Dismissal. You can make a claim to an employment tribunal, even if you haven39。t charge you more than 35% of your pensation if you win the case. If you are thinking about signing up for a damagesbased agreement, you should make sure you39。s antiracism taskforce, is in London for the Football Association39。s Premier League match at Chelsea on Sunday. I am going to be at the match tomorrow and I have asked to meet Yaya Toure, he told BBC Sport. For me it39。s 21 win. Michel Platini, president of European football39。s actions. CSKA said they were surprised and disappointed by Toure39。 May be back in the past, to oneself the paranoid weird belief disillusionment, these days, my mind has been very messy, in my mind constantly. Always feel oneself should go to do something, or write something. Twenty years of life trajectory deeply shallow, suddenly feel something, do it. 一字開(kāi)頭的年齡已經(jīng)到了尾聲??傆X(jué)得自己自己似乎應(yīng)該去做點(diǎn)什么,或者寫(xiě) 點(diǎn)什么。 The end of our life, and can meet many things really do? 而窮盡我們的一生,又能遇到多少事情是真正地非做不可? During my childhood, think lucky money and new clothes are necessary for New Year, but as the advance of the age, will be more and more found that those things are optional。t really grow up, it seems is not so important。t want to give vent to out your inner voice can be in the high school children of the feelings in a period, but was eventually infarction when graduation party in the throat, later again stood on the pitch he has sweat profusely, looked at his thrown a basketball hoops, suddenly found himself has already can39。 Originally, this world, can produce a chemical reaction to an event, in addition to resolutely, have to do, and time. 原來(lái),這個(gè)世界上,對(duì)某個(gè)事件能產(chǎn)生化學(xué)反應(yīng)的,除了非做不可的堅(jiān)決,還有,時(shí)間。s time, your ideas are always special to clear. Want, want, line is clear, as if nothing could shake his. Also once seemed to be determined to do something, but more often is he backed out at last. Dislike his cowardice, finally found that there are a lot of love, there are a lot of miss, like shadow really have been doomed. Those who do, just green years oneself give oneself an arm injection, or is a selfrighteous spiritual. 一個(gè)人的時(shí)候,自己的想法總是特別地清晰。也曾經(jīng)好像已經(jīng)下定了決心去做某件事,但更多的時(shí)候是最后又打起了退堂 鼓。那些曾經(jīng)所謂的非做不可,只是青蔥年華里自己給自己注射的一支強(qiáng)心劑,或者說(shuō),是自以為是的精神寄托罷了。 Those were broken into various shapes of stationery。 Have declared the end of the encounter that haven39。突然想到那件藍(lán)格子襯衫;那些被折成各種各樣形狀的信紙;那段從街角深巷伊始的友誼;還有那場(chǎng)還沒(méi)有開(kāi)始就宣告了終結(jié)的邂逅計(jì)劃 …… 那些年那些天的非做不可,終于和青春一樣,都將在我們的人生中謝幕