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z^3-cz^2+i
c=-1でz^3-1=0の簡易割線法の収束先を描画してみた。
z^2+1/c→z^2-0.797+0.15i
1/z^2+1/z+0.3+0.7i 1/z^2+1/z+0.3+0.15i 1/z^2+1/z-0.5+0.2i 1/z^2+1/z+0.84i
1/(z-1)+1/(z+1)+0.7+1.4i
z+1/z-0.5+0.41i
(-0.4+0.4i)z^3-1 (-0.5+0.3i)z^3-1
(x+i|y|)^2-1+0.3i
(x+i|y|)^2-0.2+0.682