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In need of help with ODE45 & Index exceeds matrix dimensions, error problem

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LALE ASIK
LALE ASIK 2017-9-8
编辑： LALE ASIK 2018-4-7
I am trying to plot a graph for LKE model.
It gives the following errors:
Index exceeds matrix dimensions.
Error in SeasonalityLKE/LKEModel (line 39)
yp(1) = b*y(1)*(1-y(1)/(min(y(3),(P-theta*y(2))/q)))-(c*y(1))/(a+y(1))*y(2);
Error in odearguments (line 90)
f0 = feval(ode,t0,y0,args{:}); % ODE15I sets args{1} to yp0.
Error in ode45 (line 115)
odearguments(FcnHandlesUsed, solver_name, ode, tspan, y0, options, varargin);
Error in SeasonalityLKE (line 22)
[t,y]=ode45(@LKEModel,[0 80],[.5; .25]);

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采纳的回答

Walter Roberson
Walter Roberson 2017-9-9
Your call
[t,y]=ode45(@LKEModel,[0 80],[.5; .25]);
indicates that the initial conditions for y are [.5; .25] which is a vector of length 2.
Your LKEModel code has
yp(1) = b*y(1)*(1-y(1)/(min(y(3),(P-theta*y(2))/q)))-(c*y(1))/(a+y(1))*y(2);
which uses y(3) which implies that your need at least three initial conditions.

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