??? Error using ==> feval
Undefined function or method 'cola_lv' for input arguments of type 'double'.
Error in ==> odearguments at 110
f0 = feval(ode,t0,y0,args{:}); % ODE15I sets args{1} to yp0.
Error in ==> ode15s at 228
[neq, tspan, ntspan, next, t0, tfinal, tdir, y0, f0, odeArgs, odeFcn, ...
Error in ==> Untitled at 6
[t,x]=ode15s('cola_lv',[0 20000],0.5*ones(1,82)');