Lotka-Volterra Predatir Prey Model Code

I used this code for the equation below however i kept getting multiple errors. Any help on this would be appreciated

Script Window:

function [dPdt] = lotkavolterra(t,P)

alpa = 1.5;

beta = 1;

gamma = 3;

delta = 1;

x = P(1);

y = P(2);

dPdt = zeros(2,1);

dPdt(1) = alpha*x - beta*x*y;

dPdt(2) = delta*x*y - gamma*y;

end

Command Window:

tspan = [0, 20];

P0 = [10, 5];

[t,P] = ode45(@(t,P)lotkavolterra(t,P),tspan,P0);

Errors:

Error using alpha

Too many output arguments.

Error in lotkavolterra (line 12)

dPdt(1) = alpha*x - beta*x*y;

Error in @(t,P)lotkavolterra(t,P)

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);

Answer 1

[Rafael Hernandez-Walls]

using this:

function [dPdt] = lotkavolterra(t,P)
alpha = 1.5; % you have error here: you using alpa
beta = 1;
gamma = 3;
delta = 1;
x = P(1);
y = P(2);
dPdt = zeros(2,1);
dPdt(1) = alpha*x - beta*x*y;
dPdt(2) = delta*x*y - gamma*y;
end

[Khushi Patel]

Oh. Thank you so much!