Using groupplot library of PGFPlots, the command \nextgroupplot can take the parameters that \begin{axis} used to take. So giving it the option "ymode=log" should effectively make the plot a semilogyaxis plot. However I do get an error when I do that:
Missing number, treated as zero.
This is strange because it works find if I gave it xmode=log it runs without errors (although giving an empty plot instead).
The minimum running example follows:
\documentclass[11pt]{article}
\usepackage[utf8x]{inputenc}
\usepackage{tikz}
\usepackage{pgfplots}
\usepgfplotslibrary{groupplots}
\begin{document}
\begin{tikzpicture}[scale=0.6]
\begin{groupplot}[ group style={group name=my plots, group size=2 by 1}, ymax=1, restrict y to domain=0:1]
\nextgroupplot[ymode=log]%
\addplot+[domain=0:6,mark=o,smooth,samples=20] {2^(-1)*exp(x)};%
\addplot+[domain=0:6,mark=square,smooth,samples=20] {1-((1-2^(-1))/exp(x))};%
\nextgroupplot%
\addplot+[domain=0:6,mark=o,smooth,samples=20] {2^(-3)*exp(x)};%
\addplot+[domain=0:6,mark=square,smooth,samples=20] {1-((1-2^(-3))/exp(x))};%
\end{groupplot}
\end{tikzpicture}
\end{document}
The equations used to plot normally in a semilogyaxis, but I wanted them in a groupplot. So the function domain and so should not be the problem.
Best Answer
You mustn't restrict the domain for the y axes. The logarithm is not defined for zero. The following works for me.