How to draw closed curve with ListPolarPlot?

*To*: mathgroup at smc.vnet.net*Subject*: [mg81056] How to draw closed curve with ListPolarPlot?*From*: Galaxia <forgalaxia at gmail.com>*Date*: Sun, 9 Sep 2007 06:19:04 -0400 (EDT)

I have a set of {theta, r} (say, size n), and want to plot them with ListPolarPlot. I want the first and last points are connected to get a closed curve. How can I do it? I tried to repeat the first data as the (n+1)th data. Then, it looked fine with the option of "Joined->True". But when I added "InterpolationOrder->2", the last two points were connected very strange. Is there any method to apply the interpolation feature and have a closed curve? Thanks a lot.