15.73  TRANSFORM 

TRANSFORM [FROM|TO CARTESIAN|POLAR|SPHERICAL] [SETS=[FROM] n1 [TO] [n2]]
          [SELECT="name"] [APPEND[=ON|OFF]] [NAME="name"] [LOG[=ON|OFF]]
Transforms data coordinates from one frame to another.  This will not work
with mesh data.  If omitted, the FROM or TO is  assumed  to  be  CARTESIAN
coordinates.
     1.  APPEND - Appends the transformed data as a new data set.
     2.  LOG - Logs the operation on your terminal.
     3.  POLAR - THETA,R,Z cordinates selected
     4.  SPHERICAL - THETA,R,PHI cordinates selected
     5.  CARTESIAN - X,Y,Z cordinates selected (Default)
                                  example
     TD:TRANSFORM FROM POLAR TO SPERICAL SET=5
Transforms data set 5. 
     TD:TRANSFORM TO POLAR
All  data  sets  are transformed from X,Y,Z to polar coordinates THETA,R,Z
respectively.