CS计算机代考程序代写 clear all;

clear all;
close all;
Delta_t=1.0;
t=0:Delta_t:8.0;

%Preallocating memory
x=zeros(size(t));

%Initial condition
x(1)=0.0;

for n=1:length(t)-1
k1=f(t(n),x(n));
k2=f(t(n)+Delta_t,x(n)+Delta_t*k1);
x(n+1)=x(n)+(Delta_t/2)*(k1+k2);
end

plot(t,x,’ko-‘,’linewidth’,2,’Markersize’,10)
hold on

tplot=0:0.01:8.0;
truesolution=@(t)(1-exp(-t))
plot(tplot,truesolution(tplot),’b-‘,’linewidth’,2)
xlabel(‘t’);
ylabel(‘x’);
legend(‘RK-2′,’True’);
axis([0 8 0 2])

function dxdt=f(t,x)
dxdt=1-x;
end