Graphics, Figures & Tables ⇒ Plotting log_{3} x in PSTricks

[coachbennett1981]

Does anyone have any idea of how to plot this function in Pstricks.. I can do log x--- x log, but I do not know how to get base three.. Is this possible?

Nick

[gmedina]

Hi,

can't you just use the fact that, for example, log_3(x)=log_10(x)/log_10(3)? In this way, log_3(x) can be plot simply by plotting the result of multiplying log_10(x) by the constant 1/log_10(3).

[CrazyHorse]

Does anyone have any idea of how to plot this function in Pstricks.. I can do log x--- x log, but I do not know how to get base three.. Is this possible?

Nick

Code: Select all

\documentclass{article}
\usepackage{pstricks-add}

\begin{document}

\begin{pspicture}(0,-3)(5,3)
\psaxes{->}(0,0)(0,-3)(5,3)[$x$,-90][$y$,180]
\psplot[algebraic,linecolor=red,
  linewidth=1.5pt]{0.1}{4}{ln(x)/ln(3)}
\psline[linestyle=dashed](3,0)(3,1)(0,1)
\end{pspicture}

\end{document} 

Herbert

[localghost]

Logarithm - Wikipedia, the free encyclopedia


Best regards
Thorsten