last value of array

while solving diff equation what is the last value of column vector

and graph between n vs x

%plot n vs x n vs y
for n=1:10
[t,r]=ode45(@fn,[0 140],[0.01+n  0.01 ])
plot (n,r(:,1))

end

function dr=fn(t,r)
x=r(1); y=r(2);
dr=zeros(2,1)
dr(1)=x+y;
dr(2)=x-y;
end

Answer 1

[Alan Stevens]

Do you mean something like this

%plot n vs x n vs y
for n=1:10
[t,r]=ode45(@fn,[0 14],[0.01+n  0.01 ]);
xlast(n) = r(end,1);
ylast(n) = r(end,2);
end
plot(1:n,xlast,'o',1:n,ylast,'s'),grid
xlabel('n'),ylabel('x,y')
legend('last x', 'last y')

function dr=fn(~,r)
x=r(1); y=r(2);
dr=zeros(2,1);
dr(1)=x+y;
dr(2)=x-y;
end

[shiv gaur]

when we increase time graph disappear t=1400

[shiv gaur]

the more value is coming about 10^19

[Alan Stevens]

That's a function of your equations!

[shiv gaur]

pl take another example you are request

[Alan Stevens]

?