[pstricks] define parameters

[Michael Sharpe]

On Oct 18, 2011, at 9:36 PM, Doris Behrendt wrote:

> herbert,
> 
> 
> On 18.10.2011, at 23:16, Herbert Voss wrote:
> 
>> Am 18.10.2011 19:52, schrieb Doris Behrendt:
>> 
>>> how can I get the following example to work?
>> 
>>> %\psaxes{->}(0,0)(!\xmin .1 add \ymin .1 add)(!\xmax .1 sub \ymax .1
>>> sub)%doesn't work
>>> \psaxes{->}(0,0)(!\xmin\space .1 add \ymin\space .1 add)(!\xmax\space .1
>>> sub \ymax\space .1 sub)%doesn't work
>>> %either
>> 
>> that is not possible for \psaxes. It never worked
>> with the ! notation. Only (#1,#2) are possible
>> 
> 
> 
> I tried, but this doesn't seem to solve my problem, look:
> 
> \documentclass[12pt]{article}
> \usepackage{pstricks}
> \usepackage{pst-plot,pst-func}
> \usepackage{pstricks-add}
> 
> 
> \newcommand{\achsenkreuz}[4]{%
> \psaxes[arrowscale=2]{->}(0,0)(#1,#2)(#3,#4)
> }
> 
> 
> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
> \begin{document}
> 
> 
> \def\xmin{-4}
> \def\xmax{4}
> \def\ymin{-4}
> \def\ymax{4}
> \def\links{\xmin .1 add}%!!!!!!!!!!!!!doesn't make sense, but I need something like this!
> %-------------------------------------> I need to first define the left coordinate of my picture, then to
> %-------------------------------------> compute automatically a number which is a little bit larger and use this one
> %-------------------------------------> as parameter in other commands, e.g. the above defined >>achsenkreuz<<
> \def\unten{#2 .1 add}
> \def\rechts{#3 .1 sub}
> \def\oben{#4 .1 sub}
> \begin{pspicture*}(\xmin,\ymin)(\xmax,\ymax)
> \achsenkreuz{\xmin}{\ymin}{\xmax}{\ymax}%works
> \achsenkreuz{\links}{\unten}{\rechts}{\oben}%does not work
> \end{pspicture*}
> \end{document}
> 
> 
> 
> 
> 
> can this be done?
> 


I don't know any way in pstricks to do exactly what you ask, but the psgraph environment does allow you to achieve the same effect---place white space around the edges of the actual range of the axes. The approach is in some ways inverse to what you seek, but equivalent.

Michael