[pstricks] Arrows in math equation?

Carsten Vogel lego at wh10.tu-dresden.de
Fri May 2 16:37:04 CEST 2008

Herbert Voss schrieb:
> Anton Suchaneck schrieb:
>> I'm just starting with pstricks and wondering if it is possible to have
>> arrows in plain math equations. For example I want in
>> \[ \ln(a^b)\]
>> an arrow from above the "b" to the empty space infront of the "\ln"
>> Is that doable?
> \documentclass[12pt,a4paper]{article}
> \usepackage{pst-node}
> \begin{document}
> \[ \rnode{ln}{\rule{0pt}{2ex}}%  for vertical centering
> \ln(a^{\protect\rnode{b}{\scriptstyle b}})\]
> \nccurve[ncurv=2,angleA=170,angleB=90,
> 	arrows=<-,arrowscale=1.5,nodesepB=2pt]{ln}{b}
> \end{document}

After looking at Herbert's proposal I learned (possibly):
- ex might be the better unit using for height-alignment
  2ex = Kegelhöhe?
- \rnode-using in powers needs a "protection".
- \rnode alters the math-script-behaviour and needs manual setting.

Please correct me, if I was wrong.
Thanks for lessons esp. to you Herbert!





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