"Matthew" wrote in message <email@example.com>... > Hello, > > I'm trying to use ode45 to solve a set of differential equations. > Rp = 5; > global Rp > [t, y] = ode45('odefunctions', [.001:.001:.8], V0); > > Where odefunctions is a separate m_file: > > function [dydt] = odefunctions(t, y) > > global Rp > Qao_current = Rp*t > > dydt = ones(2,1) > dydt(1) = (Qao_current/c) - (y(1)/(Rp*c)); > dydt(1) = (0/c) - (y(2)/(Rp*c)); > > Within odefunctions I need to define a variable thats dependent on t. This does not seem to work... and putting a loop within odefunctions does not work either... Qao_current should change with every t > > Any suggestions? > > Thanks!
What are V0 and c ? You did not define these variables. Initialize dydt as dydt=zeros(2,1). Why do you set dydt(1) two times ?