Characteristic J-V and P-V of solar cells

Hi! I'm italian and a new user in this forum, sorry for my english..but i have a problem with a characteristic of voltage-current density of solar cell. the expression to be implemented in matlab is as follows:

J=J0*(exp(V*q/(n*k*T))-1)-Jsc;

where: q=1.6e-19; k=1.38e-23; T=298; n=2; Jsc=1.27; V varied fron 0 to 2.28; J0 it too varied from 0 to 5, for example, (to check later)

according to J, the characteristic P-V will be an expression like P(i)=V(i)*J(i);

and then plotted on a single graph.

how can i create this m-file??

I'm hoping for an answer and i apologize again for my english.