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function y=mutation(chrom,P_mutation,Popsize,ecope) %均匀变异 m=25; % P=rand(Popsize,1); % n=find(P

function y=cross_over(chrom) % [m,n]=size(chrom); % temchrom=zeros(1,n); % for i=1:2:m-1 % % c=rand(1); % % temchrom=chrom(i,:); % % chrom(i,:)=c.*chrom(i,:)+(1-c).*chrom(i+1,:); %

%f(x)=sin(x) %x=0.5:0.2:1.9; %y=[0.4794,0.6442,0.7833,0.8912,0.9636,0.9975,0.9917,0.9463]; x=-1:0.01:1; y=1./(1+25*x.^2); y1=-50./(1+25.*x.^2).^2.*x;%y的导数 n=length(x); x1=-0.9:0.1:0.9; m=lengt

a=0; b=1; N=40; af=1; Euler(a,b,N,af); %Taylor(a,b,N,af); %RK(a,b,N,af);

function y=ft(x) y=4/(1+x^2);

clear all close all a=0;b=1;m=10;T=0.5;N=1000;af=1; f=inline('sin(pi*x)','x'); h=(b-a)/m; k=T/N; lmd=af^2*k/h^2; %注意lmd一定要小于0.5,只有这样差分法才稳定 x=linspace(a,b,m+1); u(1,1:N+1)=0; u(m+1,1:N+1)=0;

function y=ytiao(x,x1,m,h) n=length(x); L=length(x1); for k=1:L for i=1:n-1 if (x1(k)>=x(i)&x1(k)

function fp=fitpt() %最小二乘 %基取{1, x, ...} %fitpt.m %默认算例为课本：P65，例3.2 % x=[0,1,2,3,4,5,6,7] % y=[3.95,6.82,9.78,12.91,15.74,19.26,21.73,24.07] %结果：P(x) = 4.005 + 2.936x 平方误差=0.6162 %MatLab函

function yangtiao(X,Y,x) n=length(X); m=length(x); for i=1:n-1 h(i)=X(i+1)-X(i); end for i=2:n-1 l(i)=h(i+1)/(h(i)+h(i+1)); u(i)=1-l(i); g(i)=3*(l(i)*(Y(i)-Y(i-1))/h(i-1))+u(i

function A=euler(a,b,u0) h=(b-a)/10; t(1)=a; u1(1)=u0; u2(1)=u0; for i=2:11 u1(i)=u1(i-1)+h*f1(t(i-1),u1(i-1)); u2(i)=u2(i-1)+(h/2)*... (f1(t(i-1),u2(i-1))+f1(t(i-1)+h,u2(i-1)