15.64.44  POLAR 

SET POLAR [ON|OFF] [DEGREES|RADIANS|GRAD|PERCENT|FULLCIRCLE=n] [PERMANENT]

This  sets  up  to plot in polar coordinates.  Coordinates are (R,THETA,Z)
representaton.   This  affects not only the plotting of data, but also the 
FFT and TRANSFORM commands.
     1.  ON|OFF turn the polar coordinates on or off.  (Default:ON)
     2.  PERMANENT - Sets these parameters permanently.
     3.  DEGREES...  - Selects angle representation (Default:DEGREES)
         A.  GRAD - (0-400)
         B.  DEGREES - (0-360)
         C.  PERCENT - (0-100)
         D.  RADIANS - (0-6.2831853)
         E.  FULLCIRCLE=n - (0-n)

This  feature is not fully implemented.  You still set the limits in X,Y,Z
coordinates, and automatic scaling centers the origin.  When you plot, the
axes  are  not  automatically  generated if polar coordinates are on.  You
must manually plot the axes with the command:  PLOT AXES.  If you wish the
X and Y axes to be scaled the same way you should.
     TD:SET LIMITS SCALE
See commands:X,SET ORDER,SET STORAGE,SET SPHERICAL

                                  Example

     TD:SET POLAR FULL=1.0
Angles represented by a number from 0 to 1.0 range from 0 to 360 degrees.