How could I plot this function ( I =A* sum( ( (dt.^2)*(B.^2) )/(C.^2) ) with time please? I am getting just a constant line while I expect to get a curve because it is a function of time.
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Avan Al-Saffar
el 9 de Sept. de 2014
Comentada: Avan Al-Saffar
el 5 de Nov. de 2014
I am working with this code but it does not give me the result that I expect :
function RunFisherfixedb
x0=[12 5];
dt = 0.055;
t=(0:dt:1);
n=length(t);
Iall=zeros(1,n);
for i = 1:n
I = Fisherfixedb(t,x0,A,dt);
Iall(i)=I;
end
figure(01)
plot(t,Iall,'k')
xlabel('Time')
ylabel('Fisher Information')
title('Average Fisher information in Two-species predator-prey model')
1;
% function I = Fisherfixedb(t,x,A,dt)
% a1 = 15*x(1) - 3*x(1)*x(2);
% b1 =-5*x(2) + 0.5*x(1)*x(2);
% C= (a1.^2) + (b1.^2);
% B = ( (a1.*(15-3*x(2))+b1.*(.5*x(2))).*a1 ) + ( (a1.*(-3*x(1))+ b1.*(-5+.5* x(1))).*b1);
% I = A*sum( (dt.^2)*((B.^2)/(C.^2)));
end
5 comentarios
Guillaume
el 4 de Nov. de 2014
What is the result you see, and the result you expect?
Unfortunately, we can't test your function, since you haven't shown the code for the (badly named) system function.
Note that you may be better off starting a new question as most people won't be looking at a question that has been marked as answered. If you do that, pleas use the {} code button to format your code.
Respuesta aceptada
Guillaume
el 11 de Sept. de 2014
t is not used by your function Fisherfixeddb and all the other terms are constant, so of course, you get a constant line.
Fix your function to use t.
Note that you probably have a warning in the editor window precisely telling you that t is unused. Warnings are useful.
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