MATLAB: New Matlab user. My equations say I do not have enough inputs. How to correct this

MATLABode15s

tspan = linspace(0,15,201);
y0=[0 15];
[t, y] = ode15s(f,tspan,y0);
function dydt=f(t,y)
dydt(1)=1.57-.00145 *y(1)*y(2);
dydt(2)=7.30-.53*y(1)-.00145*y(1)*y(2);
plot(t,y);
end

Best Answer

 tspan = linspace(0,15,201);
 y0=[0 ;15]; 
 [t, y] = ode15s(@f1,tspan,y0)
 plot(t,y(:,1),'-o')
 hold on
 plot(t,y(:,2),'-ob')
 function dydt=f1(t,y)
 dydt(1)=1.57-.00145 *y(1)*y(2);
  dydt(2)=7.30-.53*y(1)-.00145*y(1)*y(2);
  dydt=[dydt(1);dydt(2)] %added this line to make sure it’s a column vector.
  end
Note:See the function file attached.
Use
[t, y] = ode15s(@f1,tspan,y0)
Instead of
[t, y] = ode15s(f1,tspan,y0)
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