# How to plot population growth model?

How would I draw the graph of a function dy/dt=((Ry^2)/T)-Ry in Mathematica?

I have tried a few times but the constants are confusing me.

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See the first example in tutorial Nonlinear IVP and BVPs –  kguler Oct 31 '12 at 17:15

You can get rid of the arbitrary constant of integration by imposing an initial condition.

dfeq = {y'[t] == R (y[t]^2/T - y[t]), y[0] == 1};
First@DSolve[dfeq, y[t], t]


{y[t] -> T/(1 - E^(R t) + E^(R t) T)}

Manipulate[
Plot[T/(1 - E^(R t) + E^(R t) T), {t, -1., 1.},
Exclusions -> (-E^(R t) + E^(R t) T == -1)],
{{R, -1.2}, -2, 2},
{{T, 0.3}, -1, 1}]


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