Polar plot with error bar

This is a simple function which uses multiple polar plots to add error bars to standard polar plot.

The function is very simple and it uses multiple polar plots. Each error bar is essentially drawn by a polar function - same angle with 2 or 3 radii.
The first two input variables ('angle' and 'avg') are same as the input variables for a standard polar plot. The last input variable is the error value. Note that the length of the error-bar is twice the error value we feed to this function.
I used a trick to set polar plot axis limit which i found at this webpage - http://stackoverflow.com/questions/226315/fixing-the-radial-axis-on-matlab-polar-plots .