[pstricks] \fileplot or \dataplot for polar coordinates

[Uwe Siart]

Dear all,

\fileplot and \dataplot handle data lists in cartesian (x,y) coordinates
instantaneously. But is it somehow possible to plot polar data (r,θ) by
means of these macros?

My first idea was to use \pstScalePoints for coordinate transform.
However, it is not possible (to my knowledge) to address both x and y
data in the xPS and yPS fields for PostScript code, which would be
essential for cartesian-to-polar.

Does anyone know of a possible solution?

-- 
Uwe