So I am very new to matlab ; now wish to use ode solver. I am a little stuck with a thing ; If I have an ouput plot as my objective to plot ; and I have the solutions of the differential equations – is there a way to know he differential equation which can be put in the ode solver in order to reach the objective plot ?
MATLAB: How to find the differential equation ? ode solver
codeodeplot
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How are you trying to use odefunction? Or why?
it is for converting symbolic expressions to function handles for ODE solvers. To be used in an ODE solver, your equations need to be differential equations. Yours are not.
Hi,
try:
% Constants
beta=5;alfa = 2.*beta/(beta+1);tau1=2;tau2=2.4;gamma=alfa.*(2-exp(-tau1));% Time frames
t1=0:0.01:tau1;t11 = tau1:0.01:4.4;t2 = tau1:0.01:tau2;t22 = tau2:0.01:4.4;t3 = tau2:0.01:4.4;% Part A
EeA = @(t) -alfa .*exp(-t) + alfa;EeA1 = EeA(t1);EeA2 = EeA(t11);plot(t1,EeA1,'-b',t11,EeA2,'--g','lineWidth',2)hold onEe1 = EeA(tau1);scatter(tau1,Ee1,'ro','lineWidth',2,'MarkerFaceColor','r')% Part B
EeB = @(t) gamma.*exp(-(t-tau1)) - alfa;EeB1 = EeB(t2);EeB2 = EeB(t22);plot(t2, EeB1,'-b',t22, EeB2,'--g','lineWidth',2)Ee2 = EeB(tau2);scatter(tau2,Ee2,'ro','lineWidth',2,'MarkerFaceColor','r')% Part C
EeC = @(t) Ee2.*exp(-(t3-tau2));EeC1 = EeC(t3);plot(t3, EeC1,'-b','lineWidth',2)hold offresults in:
This version should be correct.
Best regards
Stephan
Best Answer