This is documentation for Mathematica 6, which was
based on an earlier version of the Wolfram Language.
View current documentation (Version 11.1)

CoordinatesToCartesian

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