MATLAB: Mark the knee point on a graph

Question

Hi

I want to mark the knee point on the graph like the picture attached.

This point is the maximum power meaning ( a certain value of voltage * value of current ) gives the maximum power possible. However, it is not maximum voltage with maximum current.

In the graph 15.981 * 6.40876 gives the maximum power of this curve.

Any help regarding this?

Thanks

Answer 1

Calculate a vector of values of P = V.*I then choose the maximum. Something like:

P = V.*I;
indx = find(P==max(P));
Vp = V(indx);
Ip = I(indx);

then plot(Ip,Vp,'s')