[pstricks] Pb with pstricks-add

[Doris Wagner]

hi hassan,


> \documentclass[10pt]{article}
> \usepackage{pstricks,pstricks-add}
> \begin{document}
> \psset{algebraic=true}
> \begin{pspicture*}(-.5,-1.8)(3,4)
> \psaxes{->}(0,0)(-.5,-.5)(3,4)
> \psplot{0}{3}{ch(x))}
                     ^ here is a typo: one bracket too much

>
> \psplot{0}{3}{Argch(x)}
          ^ here is a mathematical problem: this funcion is not  
defined for values smaller or equal to 1, so you should change your  
range of x-es, say:\psplot{1}{3}{...}
>
> \psplot{0}{3}{x}
> \end{pspicture*}
> \end{document}