Elliptic Integral First Kind RF x y z actual rf(x,y,z) 0.10 0.10 0.10 3.162278e+00 3.162278e+00 0.00 1.00 2.00 1.311029e+00 1.311029e+00 100.00 100.00 100.00 1.000000e-01 1.000000e-01