Hi Christian,
At Sun, 19 Aug 2012 20:50:20 +0200,
Christian Feuersaenger wrote:
> what you seem to want is something related to the 'symbolic x coords'
> feature. That feature would expect input *coordinates* of the form
> (aaa,20) and would automatically map them to numbers - and backwards.
> The advantage is: pgfplots takes care of assigning suitable tick
> positions (based on the numeric coordinates, their range, and the size
> of the image).
Yes, it seems so.
> In your case, you have numeric input and want textual labels - and it
> seems as if you have some kind of integer-based tick label scheme.
Unfortunately, not really. I have plots with >1000 data points. I'd
like to provide labels for, say, 50 and let pgfplots choose the most
appropriate ones.
> Perhaps you can create a 'x coord inv trafo' *without* a 'x coord trafo'
> -- and use the same code as for symbolic coordinates? This would allow
> you to
What do you mean by "use the same code as for symbolic coordinates"?
Which code exactly?
It turns out the only labels that I need to transform are seconds to
more readable units so I just wrote a macro to translate seconds to a
more reasonable representation. Using your x coord inv trafo works in
a simple case, but when I try to include it in a macro, TeX complains.
First, here is a complete example of the simple case:
\documentclass{article}
\usepackage{tikz}
\usepgflibrary{fpu}
\usepackage{pgfplots}
\usepackage{filecontents}
\begin{document}
% number
% threshold
% divisor
% suffix
% else
\def\secondspphelper#1#2#3#4#5{%
\pgfmathfloatparsenumber{#1}%
\edef\num{\pgfmathresult}%
\pgfmathfloatparsenumber{#2}%
\edef\threshold{\pgfmathresult}%
\pgfmathfloatparsenumber{#3}%
\edef\divisor{\pgfmathresult}%
%
\pgfmathfloatlessthan{\num}{\threshold}%
\ifdim\pgfmathresult pt = 1 pt%
\pgfmathfloatdivide{\num}{\divisor}%
\pgfmathfloattofixed{\pgfmathresult}%
\pgfmathprintnumberto[/pgf/number
format/precision=1]{\pgfmathresult}{\pgfmathresult}%
\edef\pgfmathresult{\pgfmathresult~#4}%
\else%
#5%
\fi%
}%
% Pretty print a number of seconds.
% Example:
% \secondspp{1000}\pgfmathresult == 16.7~m
\def\secondspp#1{%
% Print as seconds for values up to 90 seconds.
\secondspphelper{#1}{90}{1}{s}{%
% Print as minutes for values up to 1 hour (= 3600 seconds)
\secondspphelper{#1}{3600}{60}{m}{%
% Print as hours for values up to 1 day (= 86400 seconds)
\secondspphelper{#1}{86400}{3600}{h}{%
% Print as days for up to 2 weeks (= 1209600 seconds)
\secondspphelper{#1}{1209600}{86400}{d}{%
% Print as weeks.
\secondspphelper{#1}{Inf}{604800}{w}{}%
}%
}%
}%
}%
}
\begin{tikzpicture}
\begin{axis}[
xticklabel={\tick},
scaled x ticks=false,
plot coordinates/math parser=false,
x coord inv trafo/.code={\secondspp{#1}}]
\addplot[domain=1:1000] {x};
\end{axis}
\end{tikzpicture}
\end{document}
Now, the full story and my new problem. Unfortunately, my plots are
being generated by a program. I include them using \input (behind a
macro called \includepgfplot). Further, each plot is actually a set
of plots: one plot for each of my data sets. As such, I wrote another
macro that does the layout and expands a plot template macro.
When I try to include the x coord inv trafo as an argument, TeX
complains (see below). I've been working on this most of the day
without success, but my TeX-foo is just not good enough... I would
greatly appreciate any help. I'm sorry I didn't manage to make my
example shorter.
% Include a plot. You need to enclosure it in a tikzpicture
% environment.
%
% Takes two arguments: additional axis arguments and the name of the
% file. Example:
%
% \begin{includepgfplot}[width=.35\textwidth]{plot}
% % Any additional tikz drawing commands.
% \end{includepgfplot}
\newenvironment{includepgfplot}[2][]{%
\def\AdditionalAxisArgs{#1}%
\input{#2}%
}{%
\EndAxis%
}
% A generated plot. Define the \AdditionalAxisArgs macro to
% additional axis arguments.
\begin{filecontents}{plot.tex}
\def\BeginAxis{\begin{axis}[}%
\expandafter\BeginAxis\AdditionalAxisArgs]%
\addplot[domain=1:1000] {x};%
\def\EndAxis{\end{axis}}%
\end{filecontents}
% Set up a plot. #1 should be an axis environment. It should set the
% axis options to include \useraxisoptions.
\def\layoutplot#1{%
\begin{tikzpicture}%
\edef\useraxisoptions{small}%
#1%
\end{tikzpicture}%
}
% This works:
%
% \layoutplot{
% \begin{includepgfplot}[\useraxisoptions]{plot}
% \end{includepgfplot}
% }
% This results in:
% ! Illegal unit of measure (pt inserted).
% <to be read again>
% x
% l.112 ...oord inv trafo/.code={\secondspp{####1}}}
% {
\layoutplot{width=.35\textwidth,
xticklabel={\noexpand\tick},
scaled x ticks=false,
plot coordinates/math parser=false,
x coord inv trafo/.code={\secondspp{####1}}}{
\begin{includepgfplot}[\useraxisoptions]{plot}
\end{includepgfplot}
}
Thanks,
Neal
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