@zenterix As I pointed out the problem is with the range. The function goes to r=infinity, so if you do not specify a plot range, Maple tries to choose one, thinking you will want to see all those really big numbers. If you right-click on your original plot (cmd-click on Mac), choose probe info and then cursor position, and run your cursor over the plot, you will see that the x axis runs in a very narrow range around 2, and the y axis runs from about -60000 to 8000. Your polarplot was also a vertical line at 2, it is just that the range was very large, so it looked like at vertical line at zero. In general, if you see a weird plot, you should modify the range to be where you think the most information is.