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Trust me, I've been trying everything I can to understand the error bars in pgfplots.

What I want to do is increase the thickness/size of the error bars, so they are clearer on the graph.

plot

This seems to increase the thickness of the bar:

\pgfplotsset{/pgfplots/error bars/error bar style={very thick}}  

No further have I got.

MWE:

\documentclass[10pt]{article}
\usepackage{graphics}
\usepackage{graphicx}
\usepackage{caption}
\usepackage{microtype}
\usepackage{tikz}
\usepackage{lscape}
\usepackage{pgfplots}
\usepackage{rotating}
\usepackage[T1]{fontenc}
\usepackage{textcomp}
\usepackage[sc]{mathpazo}
\usepackage{calc}
\renewcommand{\baselinestretch}{1.5}
\setlength{\epigraphrule}{0pt}
\patchcmd{\epigraphs}{\qitemlabel}{\qitemlabel\itemsep=1em}{}{}
%\renewcommand{\textflush}{flushepinormal}
\setlength{\beforeepigraphskip}{.5\baselineskip}
\setlength{\afterepigraphskip}{.5\baselineskip}
\setlength{\marginparwidth}{.8in}
\let\oldmarginpar\marginpar
\renewcommand\marginpar[1]{\-\oldmarginpar[\raggedleft\footnotesize #1]%
{\raggedright\footnotesize #1}}
\renewcommand{\epigraphflush}{center}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\newsavebox\mybox
\newlength\mylength
\renewcommand\boxup[2]{%
  \savebox\mybox{#1}%
  \setlength\mylength{\wd\mybox}%
  \parbox{\mylength}{#1 \\ #2}%
}
\begin{document}
\pgfplotsset{tick label style={font=\huge}}
\pgfplotsset{every axis/.append style={very thick}}
\pgfplotsset{
/pgfplots/error bars/error bar style={very thick}}
%\pgfkeysgetvalue{/pgfplots/error bars/error mark options}%
%{\pgfplotserrorbarsmarkopts}%
\begin{sidewaysfigure}
\begin{tikzpicture}[scale=.35]
\centering
\begin{axis}[%
height=20cm,  
width=60cm,
    ymax=5.1,
%minor y tick num=,
ytick={-2.5,-1,0,1,2,3,4,5},
  ymin=-3,
  xmin=1.5,
  xmax=41.5,
  axis y line*=left,
  axis x line*=bottom,
xticklabels={,,Picture~2:~Hammer~Time,Picture~3:~San~Francisco~Bridge,Picture~4:~Soldiers,Picture~5:~Floods~in~Europe,Picture~6:~Refugee~camp,Picture~7:~Heathrow,Picture~8:~Langland~Bay,Picture~9:~Wales,Picture~10:~Turkey,Picture~11:~Baltic,Picture~12:~Earthquake,Picture~13:~Earth,Picture~14:~Tanks,Picture~15:~Indian~curry,Picture~16:~Power~failure,Picture~17:Tent,Picture~18:~Airliner,Picture~19:Heavy~rain,Picture~20:~Scare,Picture~21:~Tokyo,Picture~22:~Ferry,Picture~23:~Boy,Picture~24:Fred,Picture~25:~Dublin,Picture~26:~Plane,Picture~27:~Streets,Picture28:~Painting,Picture~29:~Wales2,Picture~30:~Kobe,Picture31:~British,Picture32:~Watford,Picture33:~Sketch,Picture34:~Crash,Picture35:~Twin~ colour,Picture36:~Diana,Picture37:~Two~miners,Picture38:~Concorde,Picture39:~Italy,Picture40:~Space,Picture41:~School},
  x tick label style={rotate=65,anchor=east}]
\addplot+[only marks][error bars/.cd, bar width=3pt, y dir=both, y explicit]
coordinates {
(41,1.1333) +- (1.91002,0.35665)
(40,0.36667) +- (1.08381,-0.35048)
(39,0.33333) +- (0.616412,0.050255)
(38,1.1) +- (1.88663,0.31337)
(37,1.1667) +- (1.81032,0.52301)
(36,0.43333) +- (1.11754,-0.25087)
(35,2.4) +- (3.2694,1.5306)
(34,0.33333) +- (0.83654,-0.16988)
(33,2.5333) +- (3.2108,1.8558)
(32,0.13333) +- (0.68574,-0.41907)
(31,1.2) +- (1.95577,0.44423)
(30,-0.4) +- (0.21709,-1.01709)
(29,0.3) +- (0.87305,-0.27305)
(28,1.3333) +- (2.07584,0.59083)
(27,-0.033333) +- (0.50808,-0.57475)
(26,0.7) +- (1.22028,0.17972)
(25,-0.63333) +- (-0.049203,-1.217464)
(24,0.23333) +- (0.75852,-0.29185)
(23,0.46667) +- (1.15821,-0.22488)
(22,-0.36667) +- (0.20917,-0.94251)
(21,0.9) +- (1.5229,0.2771)
(20,0.83333) +- (1.624435,0.042232)
(19,-0.033333) +- (0.47131,-0.53798)
(18,-0.53333) +- (0.12253,-1.1892)
(17,0.16667) +- (0.44547,-0.11213)
(16,0.76667) +- (1.3686,0.1647)
(15,0.86667) +- (1.32382,0.40951)
(14,0.4) +- (1.06941,-0.26941)
(13,0.5) +- (0.935794,0.064206)
(12,0.36667) +- (0.61635,0.11698)
(11,-0.23333) +- (0.28262,-0.74928)
(10,0.23333) +- (0.58257,-0.1159)
(9,1.4) +- (2.04003,0.75997)
(8,1.1) +- (1.82293,0.37707)
(7,1.3667) +- (2.0352,0.6981)
(6,0.26667) +- (0.94558,-0.41225)
(5,0) +- (0.59648,-0.59648)
(4,0.9) +- (1.67431,0.12569)
(3,-0.66667) +- (0.09502,-1.42835)
(2,0.56667) +- (1.30495,-0.17162)
};

\addplot+[only marks]
coordinates{%
(7,2.3) 
(9,2.4) 
(15,1.6)
(28,2.1)
(33,5) 
(35,4.5) 
(37,2) 
};

\addplot[dashed] coordinates {(-1,0) (42,0)};
\end{axis}
\end{tikzpicture}%
\centering
\hspace{50cm}
\parbox{16cm}{\caption{Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam, eaque ipsa quae ab illo inventore veritatis et quasi architecto beatae vitae dicta sunt explicabo. Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione voluptatem sequi nesciunt. Neque porro quisquam est, qui dolorem.}}
\end{sidewaysfigure}
\end{document}
share|improve this question
    
A MWE should only load those packages related to the problem. Loading unnecessary packages makes compilation slower and means that people who want to try out the code might have to install extra packages, even though they're not needed. –  Jake Jun 5 '11 at 14:45
    
I know Jake. I keep taking out superfluous packages, and it ruins the formatting. I can't work out which ones are not necessary. I am trying! –  Frank_Zafka Jun 5 '11 at 14:47

1 Answer 1

up vote 7 down vote accepted

The error marks are influenced by the key /error bars/error mark options. Using this key resets the initial option, which is rotate=90, so you have to include that as well:

\documentclass{article}

\usepackage{pgfplots}

\begin{document}
\begin{tikzpicture}
\begin{axis}
\addplot+[only marks,
  error bars/.cd,
    y dir=both,
    y explicit,
    error bar style={line width=2pt},
    error mark options={
      rotate=90,
      red,
      mark size=8pt,
      line width=2pt
    }
]
coordinates {
(0,1) +- (0,0.35665)
(1,1.5) +- (0,-0.35048)
(2,0) +- (0,0.150255)
};
\end{axis}
\end{tikzpicture}
\end{document}

custom error bars

share|improve this answer
1  
Sorted. I even worked out how to increase the marks myself [mark options={scale=2}]. Many thanks. –  Frank_Zafka Jun 5 '11 at 15:47

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