Question on distinguish lines in graph

function Math462HW4Q4partbb

V=1;

k01=1/3;

k02=1/2;

k21=2/3;

k12=3/2;

tspan=1:1:10;

x1=0;

x2=0;

y=x1/V;

vector=[x1,x2,y];

%Apply the function ode45

[t,x]=ode45(@(t,vector)derivativefunc(t,vector,V,k01,k02,k21,k12), tspan,vector);

plot(t,x); %Plot solutions out.

xlabel('time');

ylabel('our solution');

title('Solution of logistic equation');

%We are trying to express xdot which is the given equation in the question.

function ddt=derivativefunc(~,x12y,V,k01,k02,k21,k12)

x1=x12y(1);

x2=x12y(2);

y=x12y(3);

x1dot=15+k12*x2-(k01+k21)*x1;

x2dot=k21*x1-(k02+k12)*x2;

Y=x1/V;

ddt=[x1dot;x2dot;Y];

end

end

In my code, I have three variables, which are x1,x2, and y. When I graphed it, MATLAB gives me three lines with different color, now I am having trouble in figuring out which line corresponds to which variable. Can someone help me with this?

Answer 1

[Walter Roberson]

legend({'x1', 'x2', 'y'})