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PlotVectorField for NonLinear Discrete DE.


Hi,
I was hoping some one would help me with this NonLinear DE.
I would like to plot the direction field for the same.

N[t+1] = N[t] * exp[r *[ (1- N[t])-aP[t]]]
P[t+1]=P[t]*c*[1-exp[-aP[t]].

Thank you,
Mina


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