[Tex/LaTex] How to plot a scatterplot in PGFPlots

pgfplots

I tried to plot a scatterplot from data. I took hint from the site http://pgfplots.sourceforge.net/gallery.html and my tex file is

\documentclass[a4paper]{amsart}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage[finnish]{babel}
\usepackage{url}
\usepackage{parskip} % Tyhjä rivi kappaleiden väliin.
\usepackage{booktabs}
\usepackage{tikz,pgfplots}
\renewcommand*\arraystretch{2}
\listfiles
\begin{document}

\begin{tikzpicture}
\begin{axis}[%
scatter/classes={%
    a={mark=o,draw=black}}]
\addplot[scatter,only marks,%
    scatter src=explicit symbolic]%
table[meta=label] {
x y label
1 4.3 a
2 5.1 a
3 5.7 a
4 6.3 a
5 6.8 a
6 7.1 a
7 7.2 a
8 7.2 a
9 7.2 a
10 7.2 a
11 7.5 a
12 7.8 a
    };
\end{axis}
\end{tikzpicture}
\end{document}

However, LaTeX said the following:

    ! Package pgfplots Warning: You requested to open table ' x y label 1 4.3 a 2 5
    .1 a 3 5.7 a 4 6.3 a 5 6.8 a 6 7.1 a 7 7.2 a 8 7.2 a 9 7.2 a 10 7.2 a 11 7.5 a 
    12 7.8 a ', but there is also a ' x y label 1 4.3 a 2 5.1 a 3 5.7 a 4 6.3 a 5 6
    .8 a 6 7.1 a 7 7.2 a 8 7.2 a 9 7.2 a 10 7.2 a 11 7.5 a 12 7.8 a .tex'. TeX will
     automatically append the suffix '.tex', so I will now open ' x y label 1 4.3 a
     2 5.1 a 3 5.7 a 4 6.3 a 5 6.8 a 6 7.1 a 7 7.2 a 8 7.2 a 9 7.2 a 10 7.2 a 11 7.
    5 a 12 7.8 a .tex'. Please make sure you don't accidentally load TeX files - th
    is may produce unrecoverable errors.
    ! Extra \or.
    <argument> ...dcsname \end \pgfplotstable@EOI \or 
                                                      \let \pgfplotstableread@im...
    l.33     };

    ? x

Log file gives:

File: tikzlibrarytopaths.code.tex 2008/06/17 v2.10 (rcs-revision 1.2)
))) (/usr/share/texmf-texlive/tex/latex/pgfplots/pgfplots.sty
Package: pgfplots 2009/02/14 Version 1.2.2

(/usr/share/texmf-texlive/tex/generic/pgfplots/pgfplots.code.tex
(/usr/share/texmf-texlive/tex/generic/pgfplots/pgfplotscore.code.tex
\t@pgfplots@toka=\toks37
\t@pgfplots@tokb=\toks38
\t@pgfplots@tokc=\toks39
\pgfplots@tmpa=\dimen173
)
(/usr/share/texmf-texlive/tex/generic/pgfplots/oldpgfcompatib/pgfplotsoldpgfsup
p_loader.code.tex
Package pgfplots: loading complementary code for your PGF version...

(/usr/share/texmf-texlive/tex/generic/pgfplots/oldpgfcompatib/pgfplotsoldpgfsup
p_misc.code.tex)
(/usr/share/texmf-texlive/tex/generic/pgfplots/oldpgfcompatib/pgfplotsoldpgfsup
p_pgfkeysfiltered.code.tex
\pgfkeys@tmptoks=\toks40
)
(/usr/share/texmf-texlive/tex/generic/pgfplots/oldpgfcompatib/pgfplotsoldpgfsup
p_pgfmathfloat.code.tex
\c@pgfmathroundto@lastzeros=\count124
)
(/usr/share/texmf-texlive/tex/generic/pgfplots/oldpgfcompatib/pgfplotsoldpgfsup
p_pgflibraryplothandlers.code.tex
File: pgfplotsoldpgfsupp_pgflibraryplothandlers.code.tex 2009/02/13 v2.10 (rcs-
revision 1.7)
\pgf@plot@mark@count=\count125
\pgfplotmarksize=\dimen174
)
(/usr/share/texmf/tex/generic/pgf/libraries/pgflibraryfpu.code.tex))
(/usr/share/texmf-texlive/tex/generic/pgfplots/util/pgfplotsutil.code.tex
(/usr/share/texmf-texlive/tex/generic/pgfplots/liststructure/pgfplotsliststruct
ure.code.tex)
(/usr/share/texmf-texlive/tex/generic/pgfplots/liststructure/pgfplotsliststruct
ureext.code.tex)
(/usr/share/texmf-texlive/tex/generic/pgfplots/liststructure/pgfplotsarray.code
.tex
\c@pgfplotsarray@tmp=\count126
)
(/usr/share/texmf-texlive/tex/generic/pgfplots/numtable/pgfplotstable.code.tex
\c@pgfplotstable@counta=\count127
\pgfplotstable@outfile=\write4

(/usr/share/texmf-texlive/tex/generic/pgfplots/numtable/pgfplotstable.coltype.c
ode.tex)))
(/usr/share/texmf-texlive/tex/generic/pgfplots/util/pgfplotscolormap.code.tex)
(/usr/share/texmf-texlive/tex/generic/pgfplots/pgfplots.stackedplots.code.tex)
(/usr/share/texmf-texlive/tex/generic/pgfplots/pgfplotscoordprocessing.code.tex
) (/usr/share/texmf-texlive/tex/generic/pgfplots/pgfplotsticks.code.tex)
(/usr/share/texmf/tex/generic/pgf/frontendlayer/tikz/libraries/tikzlibrarydecor
ations.code.tex
(/usr/share/texmf/tex/generic/pgf/modules/pgfmoduledecorations.code.tex
\pgfdecoratedcompleteddistance=\dimen175
\pgfdecoratedremainingdistance=\dimen176
\pgfdecoratedinputsegmentcompleteddistance=\dimen177
\pgfdecoratedinputsegmentremainingdistance=\dimen178
\pgf@decorate@distancetomove=\dimen179
\pgf@decorate@repeatstate=\count128
\pgfdecorationsegmentamplitude=\dimen180
\pgfdecorationsegmentlength=\dimen181
)
\tikz@lib@dec@box=\box38
)
(/usr/share/texmf/tex/generic/pgf/frontendlayer/tikz/libraries/tikzlibrarydecor
ations.pathmorphing.code.tex
(/usr/share/texmf/tex/generic/pgf/libraries/decorations/pgflibrarydecorations.p
athmorphing.code.tex))
(/usr/share/texmf/tex/generic/pgf/frontendlayer/tikz/libraries/tikzlibrarydecor
ations.pathreplacing.code.tex
(/usr/share/texmf/tex/generic/pgf/libraries/decorations/pgflibrarydecorations.p
athreplacing.code.tex))
\pgfplots@numplots=\count129
\pgfplots@xmin@reg=\dimen182
\pgfplots@xmax@reg=\dimen183
\pgfplots@ymin@reg=\dimen184
\pgfplots@ymax@reg=\dimen185
\pgfplots@zmin@reg=\dimen186
\pgfplots@zmax@reg=\dimen187
)
(/usr/share/texmf/tex/generic/pgf/frontendlayer/tikz/libraries/tikzlibraryplotm
arks.code.tex
File: tikzlibraryplotmarks.code.tex 2008/01/09 v2.10 (rcs-revision 1.1)

So, what is an easy way to draw scatter plots in LaTeX? And how can I add a regression line to the plot?

Update: These are the versions of files I'm using:

grep File testi.log
File: amsgen.sty 1999/11/30 v2.0
File: umsa.fd 2009/06/22 v3.00 AMS symbols A
File: utf8.def 2008/04/05 v1.1m UTF-8 support for inputenc
File: t1enc.dfu 2008/04/05 v1.1m UTF-8 support for inputenc
File: ot1enc.dfu 2008/04/05 v1.1m UTF-8 support for inputenc
File: omsenc.dfu 2008/04/05 v1.1m UTF-8 support for inputenc
File: t1enc.def 2005/09/27 v1.99g Standard LaTeX file
File: babel.def 2008/07/06 v3.8l Babel common definitions
File: graphics.cfg 2009/08/28 v1.8 graphics configuration of TeX Live
File: dvips.def 1999/02/16 v3.0i Driver-dependant file (DPC,SPQR)
File: pgf.cfg 2008/05/14  (rcs-revision 1.7)
File: pgfsys-dvips.def 2008/04/03  (rcs-revision 1.20)
File: pgfsys-common-postscript.def 2008/10/01  (rcs-revision 1.22)
File: pgfsyssoftpath.code.tex 2008/07/18  (rcs-revision 1.7)
File: pgfsysprotocol.code.tex 2006/10/16  (rcs-revision 1.4)
File: color.cfg 2007/01/18 v1.5 color configuration of teTeX/TeXLive
File: pgfcorepoints.code.tex 2010/04/09  (rcs-revision 1.20)
File: pgfcorepathconstruct.code.tex 2010/08/03  (rcs-revision 1.24)
File: pgfcorepathusage.code.tex 2008/04/22  (rcs-revision 1.12)
File: pgfcorescopes.code.tex 2010/09/08  (rcs-revision 1.34)
File: pgfcoregraphicstate.code.tex 2008/04/22  (rcs-revision 1.9)
File: pgfcoretransformations.code.tex 2009/06/10  (rcs-revision 1.11)
File: pgfcorequick.code.tex 2008/10/09  (rcs-revision 1.3)
File: pgfcoreobjects.code.tex 2006/10/11  (rcs-revision 1.2)
File: pgfcorepathprocessing.code.tex 2008/10/09  (rcs-revision 1.8)
File: pgfcorearrows.code.tex 2008/04/23  (rcs-revision 1.11)
File: pgfcoreshade.code.tex 2008/11/23  (rcs-revision 1.13)
File: pgfcoreimage.code.tex 2010/03/25  (rcs-revision 1.16)
File: pgfcoreexternal.code.tex 2010/09/01  (rcs-revision 1.17)
File: pgfcorelayers.code.tex 2010/08/27  (rcs-revision 1.2)
File: pgfcoretransparency.code.tex 2008/01/17  (rcs-revision 1.2)
File: pgfcorepatterns.code.tex 2009/07/02  (rcs-revision 1.3)
File: pgfmoduleshapes.code.tex 2010/09/09  (rcs-revision 1.13)
File: pgfmoduleplot.code.tex 2010/10/22  (rcs-revision 1.8)
File: pgflibraryplothandlers.code.tex 2010/05/31 v2.10 (rcs-revision 1.15)
File: pgfmodulematrix.code.tex 2010/08/24  (rcs-revision 1.4)
File: tikzlibrarytopaths.code.tex 2008/06/17 v2.10 (rcs-revision 1.2)
File: pgfplotsoldpgfsupp_pgflibraryplothandlers.code.tex 2009/02/13 v2.10 (rcs-
File: tikzlibraryplotmarks.code.tex 2008/01/09 v2.10 (rcs-revision 1.1)
File: pgflibraryplotmarks.code.tex 2010/10/15 v2.10 (rcs-revision 1.12)
File: umsa.fd 2009/06/22 v3.00 AMS symbols A
File: umsb.fd 2009/06/22 v3.00 AMS symbols B

Best Answer

I think you are missing a label column. The following MWE works fine here:

\documentclass{article}

\usepackage{tikz,pgfplots}

\begin{document}

\begin{tikzpicture}
\begin{axis}[%
scatter/classes={%
    a={mark=o,draw=black}}]
\addplot[scatter,only marks,%
    scatter src=explicit symbolic]%
table[meta=label] {
x y label
1 4.3 a
2 5.1 a
3 5.7 a
4 6.3 a
5 6.8 a
6 7.1 a
7 7.2 a
8 7.2 a
9 7.2 a
10 7.2 a
11 7.5 a
12 7.8 a
    };
\end{axis}
\end{tikzpicture}

\end{document}

enter image description here

1. Manual Fit Line:

So using another \addplot and correcting the domain to 0:08:

\addplot [color=red, domain=0:0.08, mark=none] {0.0051026+10.372231*\x};

you get:

enter image description here

Code:

\documentclass{article}
\usepackage{pgfplots}
\usepackage{pgfplotstable}

\begin{document}
\begin{tikzpicture}[domain=0:8]
\begin{axis}[xlabel={$\Delta x$ (m)}, ylabel={$Mg$ (N)}]
%    \draw[color=red, domain=0:1000] plot (\x,{0.0051026+10.372231*\x}) node[below right] {};

\addplot [color=red, domain=0:0.08, mark=none] {0.0051026+10.372231*\x};

\addplot[scatter, only marks, scatter src=\thisrow{class},
      error bars/.cd, y dir=both, x dir=both, y explicit, x explicit, error bar style={color=mapped color}]
      table[x=x,y=y,x error=xerr,y error=yerr] {
x      xerr      y        yerr     class
0.0047 0.0007071 0.054039 0.000098 0
0.0142 0.0007071 0.152651 0.000098 0
0.0237 0.0007071 0.252051 0.000098 0
0.0332 0.0007071 0.350466 0.000098 0
0.0525 0.0007071 0.548380 0.000098 0
0.0622 0.0007071 0.646893 0.000098 0
0.0720 0.0007071 0.746195 0.000098 0
0.0802 0.0007071 0.844709 0.000098 0
};


\end{axis}
\end{tikzpicture}
\end{document}

2. Automatic Fit Line:

Alternatively you could let pgfplots compute the regression line for you by using the same data with:

\addplot [red, mark=none] table[y={create col/linear regression={y=y}}

enter image description here

Notes:

Note that in this case the regression line is automatically only between the extreme points. You would need to adjust your domain to get the same results.
You should not duplicate the data as I have done.

Code:

\documentclass{article}
\usepackage{pgfplots}
\usepackage{pgfplotstable}

\begin{document}
\begin{tikzpicture}[domain=0:8]
\begin{axis}[xlabel={$\Delta x$ (m)}, ylabel={$Mg$ (N)}]
%    \draw[color=red, domain=0:1000] plot (\x,{0.0051026+10.372231*\x}) node[below right] {};

\addplot[scatter, only marks, scatter src=\thisrow{class},
      error bars/.cd, y dir=both, x dir=both, y explicit, x explicit, error bar style={color=mapped color}]
      table[x=x,y=y,x error=xerr,y error=yerr] {
x      xerr      y        yerr     class
0.0047 0.0007071 0.054039 0.000098 0
0.0142 0.0007071 0.152651 0.000098 0
0.0237 0.0007071 0.252051 0.000098 0
0.0332 0.0007071 0.350466 0.000098 0
0.0525 0.0007071 0.548380 0.000098 0
0.0622 0.0007071 0.646893 0.000098 0
0.0720 0.0007071 0.746195 0.000098 0
0.0802 0.0007071 0.844709 0.000098 0
};

\addplot [red, mark=none] table[y={create col/linear regression={y=y}}] {
x      xerr      y        yerr     class
0.0047 0.0007071 0.054039 0.000098 0
0.0142 0.0007071 0.152651 0.000098 0
0.0237 0.0007071 0.252051 0.000098 0
0.0332 0.0007071 0.350466 0.000098 0
0.0525 0.0007071 0.548380 0.000098 0
0.0622 0.0007071 0.646893 0.000098 0
0.0720 0.0007071 0.746195 0.000098 0
0.0802 0.0007071 0.844709 0.000098 0
};

\end{axis}
\end{tikzpicture}
\end{document}

Best Answer

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1. Manual Fit Line:

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2. Automatic Fit Line:

Notes:

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