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# Comparing with the analytical potential

Plot a log-log plot of rho(r):
- the discrete solution has poissonian error: 1/sqrt(N) where N is the number of particles in the bins

=> ensure the discretization is consistent


# Comparing forces
- Use newtons law by considering only the inner shells:
F_i = GM(R_i)/R_i^2


=> this should all be done with the .ascii file (All particles, not yet meshed)




## Task2
a) start with only the monopole and compare with the direct summation
only then build the tree code
