Iteration:0 value:4 error:8.5840734641e-01
Iteration:1 value:2.842178718 error:2.9941393594e-01
Iteration:2 value:3.15087294 error:9.2802860956e-03
Iteration:3 value:3.141592387 error:2.6642673445e-07
Apparent order of convergence at iteration 1:3.88071
Apparent order of convergence at iteration 2:3.23475
For reference: pi=3.141592654