I'm trying to get error bars to show correctly on my plot using pgfplots. I am wanting explicit relative error bars in both directions for my y-data, and what I am getting is perplexing. The error bars extend down to the bottom of the graph instead of being symmetric around the data points of interest, and within the relative range I have specified.
Here is the code:
\documentclass[class=minimal,border=0pt]{standalone}
\usepackage{color}
\usepackage{tikz}
\usetikzlibrary{calc}
\usepackage{pgfplots}
\pgfplotsset{compat=newest}
\definecolor{darkgreen}{rgb}{0.125,0.5,0.169}
\newcommand{\footnotesize}{\fontsize{7pt}{9pt}\selectfont}
\usepackage{filecontents}
\begin{filecontents*}{Td.dat}
theta exp sim relativeerror errorbars
10 5439.5 3241.8 -40.4026 0.036212
20 12256.5 10518.1 -14.1832 0.023798
30 18469.5 19819.8 7.3109 0.021885
40 26900 28341.3 5.358122 0.021386
50 40902 44859.2 9.674814 0.021262
60 46348 51647.4 11.43391 0.02124
70 43877 47986.3 9.365563 0.021231
80 41886.5 48017.3 14.63673 0.021239
90 24937 32576.7 30.63588 0.021409
\end{filecontents*}
\begin{document}
\begin{tikzpicture}
\pgfplotsset{every axis legend/.append style={at={(0.5,1.05)},anchor=south}, legend columns=3,
xmin = 0, xmax = 100,
xtick={10,30,...,90},
minor x tick num=1,
y axis style/.style={yticklabel style=#1, ylabel style=#1, y axis line style=#1, ytick style=#1}
}
\begin{axis}[width=3.25in,height=3.25in,
axis y line*=left,
y axis style=black,
minor y tick num=3,
ymin = 0, ymax = 60000,
%ytick={0,10000,...,60000},
xlabel={Valve Angle Opening, $\theta$ (deg.)},
ylabel={Hydrodynamic Torque, $T_{d \theta}$ (lbf-in)},
scaled ticks=false]
\addplot[darkgreen,mark=square, line width=1.0, densely dashed, mark options=solid,mark size=2.5,
error bars/.cd, error mark=-, x dir=none, y dir=both, y explicit relative]
table[x=theta, y=exp, y error=errorbars] {Td.dat};
\label{expplot}
% \addplot[blue,mark=o,line width=1.0,mark options=solid,mark size=2.5]
% table[x=theta,y=sim] {Td.dat};
% \label{simplot}
\end{axis}
%\begin{axis}[width=3.25in,height=3.25in,
% axis y line*=right,
% axis x line=none,
% minor y tick num=1,
% ymin=-50, ymax=50,
% ytick={-50,-40,...,50},
% ylabel=Relative Difference from Experiment (\%),
% y axis style=red!75!black,
% yticklabel style={/pgf/number format/.cd,fixed,fixed zerofill,precision=0,/tikz/.cd},]
%
% \addlegendimage{/pgfplots/refstyle=expplot}\addlegendentry{Experiment}
% \addlegendimage{/pgfplots/refstyle=simplot}\addlegendentry{Simulation}
%
% \addplot[red,mark=x, line width=1.0, densely dashed, mark options=solid,mark size=2.5]
% table[x=theta,y=relativeerror] {Td.dat};
% \addlegendentry{Relative Diff.}
%\end{axis}
\end{tikzpicture}
\end{document}
Anyone have a clue what I might be doing wrong?
!in front of it to turn it into a link. A moderator or another user with edit privileges can then reinsert the!to turn it into an image again. – hpesoj626 Nov 19 '12 at 5:42filecontents*environment so that thefilecontentsheader is not written to the file. But even with that, this does not compile for me. Please ensure the the MWE posted compiles for you. – Peter Grill Nov 19 '12 at 10:54filecontentspackage, so there's no need to use the*version here. – Jake Nov 22 '12 at 11:15