Function return multiple variables

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1 个投票

My question is very simple, my function has values for x,y,t but only displays values for x. I want the values of y and t to also be returned.

function [x, y, t] = IVP(c)
%UNTITLED Summary of this function goes here
%   Detailed explanation goes here
syms x y h t;
h=c;
x=zeros(1,30);
y=zeros(1,30);
u=[2;1];
t=[0:1:29];
for i=2:1:30
  x(1)=2;
  y(1)=1;
  x(i)=u(1)+h*(1.2*u(1)-0.6*u(1)*u(2));
  y(i)=u(2)+h*(0.3*u(1)*u(2)-0.8*u(2));
  u(1)=x(i);
  u(2)=y(i);
end
plot(t,x,'b',t,y,'k');
xlabel('time') % x-axis label
ylabel('Population of Prey and Predator') % y-axis label
legend('x(t)-prey','y(t)-predator')
end

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Nagarjun Vinukonda 2020-10-25

编辑：Nagarjun Vinukonda 2020-10-25

I was having the same trouble, it is because before the function you are not calling variables properly. You should call the function as provided in answer.

Joe Payne 2022-2-28

Is that eulers method for solving the preditor pray system of 2 first order ODEs. Cus I'm doing a project on solving the preditor prey equation. If you are too what books/websites would you recommend?

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