[pstricks] How to show a specific point of a function's curve?
Herbert Voss
Herbert.Voss at FU-Berlin.DE
Mon Jan 24 21:55:38 CET 2011
Am 24.01.2011 16:06, schrieb Denis Bitouzé:
> Le lundi 24/01/11 à 15h40,
> Herbert Voss <Herbert.Voss at fu-berlin.de> a écrit :
>
>> in general yes, but the problem is that we already have tons
>> of macros and nobody really knows all names and meanings ...
>
> Indeed, but such a macro would be very useful and, restricted to
> pst-plot, wouldn't be lost in tons of others. IMHO, this macro would be
> much more useful to the average user than, for instance, LineToXAxis and
> LineToYAxis (which are nice! :)...
this maybe possible, it's really simple. Would be part of pst-plot
\documentclass{article}
\usepackage{pst-plot}
\makeatletter
\def\psCoordinates{\pst at object{psCoordinates}}
\def\psCoordinates at i(#1){%
\pst at killglue%
\begin at OpenObj
\SpecialCoor%
\psline(#1|0,0)(#1)\psline(#1)(0,0|#1)\psdot(#1)%
\end at OpenObj%
\ignorespaces%
}
\pagestyle{empty}
%
\makeatother
\begin{document}
\begin{pspicture}(10,10)
\psaxes{->}(10,10)
\psplot[algebraic,linecolor=red,linewidth=2pt]{0}{10}{x^2/10}
\psCoordinates(*2 {x^2/10})
\psCoordinates[linecolor=blue,linestyle=dashed,
dotstyle=square,dotscale=2](*4 {x^2/10})
\psCoordinates[arrows=->,linecolor=blue,linestyle=dotted,
dotstyle=triangle,dotscale=2](*8 {x^2/10})
\end{pspicture}
\end{document}
Herbert
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