dN/dt = s + ( g*N*T^2) /(h + T^2) - ( C *T - p*D -q*L) *N - (z*M*N) -( e*N)

Answer 1

[VBBV]

f = @(T,N) (s+ ((g*N*T^2)/(h+T^2)) - ...)  % change small case t to Upper case T and try

f is function of T and N and not small t. Matlab is case senstive.

[VBBV]

It seems you also have ode45.m Its a standard Matlab function. If its defined by you for your problem rename it to something other than standard Matlab function names,

[Diksha Gautam]

But in other equation I was used t and T