Hey,
Note: If you have any queries related the answer please do comment. I would be very happy to resolve all your queries.
clc
clear all
close all
n1=3;
n2=11;
a=2+n2/100;
b=a*(0.7+n1/100);
c=a/4;
d=c/2;
h=0.25;
f=@(t,y) [a*y(1)-b*y(1)*y(2),-c*y(1)+d*y(1)*y(2)];
[T,Y]=runge2(f,[0,6],[2+n1/5,1+n1/10],0.25);
plot(T,Y);
legend('x(t)','y(t)');
figure;
plot(Y(:,1),Y(:,2));
function [t,ystar]=runge2(f,tspan,y0,h)
t=tspan(1):h:tspan(2);
ystar = zeros(length(t),2); % Preallocate array (good coding practice)
ystar(1,:) = y0; % Initial condition gives solution at t=0.
for i=1:(length(t)-1)
k1 = f(t(i),ystar(i,:)); % Approx for y gives approx for deriv
y1 = ystar(i,:)+k1*h/2; % Intermediate value
k2 = f(t(i),y1); % Approx deriv at intermediate value.
ystar(i+1,:) = ystar(i,:) + k2*h; % Approximate solution at next value of y
end
end
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