[pstricks] inverse functions

[E. Krishnan]

On Tue, 30 Sep 2003, Jacques L'helgoualc'h wrote:

> Unfortunately, atan value is not in [-90;+90], but in [0;180] :-/

I don't get it. Mathematically the range of atan *is* (-90,90), but in 
PostScript it is (0,360). Try for example
  
  2 3 atan
  2 neg 3 3 atan
  2 neg 3 neg atan
  2 3 neg atan 
  
 

-- 
Krishnan