I waa plot a B-field line around the earth. (with 2D plot)
Thus, I'm willing to draw the field line except the earth(i.e. draw only when r>r_E).
I tried to cover the field line by covering with the white circle, but it should not work because my B-filed function diverges at the origin(0,0)...
I know such problem might be solved by changing the grid not to take (0,0). However I wish to know excluding some region by the code.
Help me, super coders!!!