This is documentation for Mathematica 8, which was
based on an earlier version of the Wolfram Language.
View current documentation (Version 11.2)

CoordinatesFromCartesian

CoordinatesFromCartesian[pt]
gives the coordinates in the default coordinate system of the point pt given in coordinates.

gives the coordinates in the coordinate system coordsys of the point given in coordinates.
Find the cylindrical coordinates for a point in space:
Transform back to Cartesian coordinates:
Needs["VectorAnalysis`"]
Find the cylindrical coordinates for a point in space:
In[2]:=
Click for copyable input
Out[2]=
Transform back to Cartesian coordinates:
In[3]:=
Click for copyable input
Out[3]=