polar
Polar plots.
`polar(r,theta)`
`polar(r,theta, plotspec)`
`polar(r1,theta1, plotspec1, r2, theta2, plotspec2,...)`
 Inputs `r` A vector of `r`-coordinates of the curve to be drawn. `theta` A vector of `theta` -coordinates of the curve to be drawn. `{r1, theta1, r2, theta2,..}` Pairs of vectors of `R-theta` coordinates of the curves to be drawn. `plotspec` Plot style specification string. `{plotspec1, plotspec2,..}` Plot style specification strings.

Description
`polar(r,theta)` draws the polar plot of the input.

`polar(r,theta, plotspec)` draws the polar plot of the input according to the specifications in the string `plotspec` , the rules for constructing which may be found in plot.

Multiple curves may be drawn by specifying each curve by either the pair `r, theta` or the triple `r, theta, plotspec` for each curve in succession.
Example
```>>t=[0:.01:1]*2pi
>>r=(1+2cos(t))
>>r1=(1+2cos(2t))
>>polar(r,t,'r:',r1,t,'b')
>>title("Polar Plot")
>>legends({"1+2cos(t)","1+2cos(2t)"});
```