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last value of array

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shiv gaur
shiv gaur on 31 Aug 2021
Commented: Alan Stevens on 31 Aug 2021
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

Answers (1)

Alan Stevens
Alan Stevens on 31 Aug 2021
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
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