[pstricks] inverse functions

[Herbert Voss]

Jacques L'helgoualc'h schrieb:

> Ok, so it  is rather equal to  (in degrees) 180 + arg(-x,-y),  and I can
> plot the True Mathematical Atan(x) with
> 
>  \psplot{-8}{8}{x neg -1 atan 180 sub 180 div 3.1416 mul}

or the same with parametricplot

   \pstVerb{/k 3.1416 180.0 div def}
   \parametricplot{-1.446}{1.446}{t k div dup sin exch cos div t}


Herbert


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