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<div> <span class="normalsize"> <center> <big class="xhuge"><b class="bf">PyXPlot Users’ Guide</b></big><br /></center> <center> <big class="xxlarge"><b class="bf">A Command-line Data Processing, <br /> Graph Plotting and <br /> Vector Graphics Suite. <br /></b></big> </center> <center> <big class="xlarge">Version 0.9.2<br /></big> </center> <center>
<img src="images/img-0002.png" alt="\includegraphics[width=10cm]{examples/eps/ex_cover}" style="width:10cm" /> </center> <center> <big class="xlarge">Dominic Ford, Ross Church <br /> Email: <tt class="tt">coders@pyxplot.org.uk</tt> <br /></big> </center> <center> <big class="xlarge">September 2012<br /></big> </center> </span></div>
<div class="contents document-contents"><!--<strong>Subsections</strong>-->
<ul>
<li><a href="sect0001.html">1 Introduction to PyXPlot</a>
<ul>
<li><a href="ch-introduction.html">1 Introduction</a>
<ul>
<li><a href="sect0002.html">1.1 What is Pyxplot?</a>
</li><li><a href="sect0003.html">1.2 Compatibility with gnuplot</a>
</li><li><a href="sect0004.html">1.3 The structure of this manual</a>
</li><li><a href="sect0005.html">1.4 An introductory tour</a>
</li><li><a href="sect0006.html">1.5 License</a>
</li><li><a href="sect0007.html">1.6 Spelling conventions</a>
</li><li><a href="sect0008.html">1.7 Acknowledgments</a>
</li>
</ul>
</li><li><a href="ch-installation.html">2 Installation</a>
<ul>
<li><a href="sect0009.html">2.1 Installation within Linux distributions</a>
</li><li><a href="sect0010.html">2.2 System requirements</a>
</li><li><a href="sect0013.html">2.3 Installation from source archive</a>
</li>
</ul>
</li><li><a href="ch-first_steps.html">3 First steps with Pyxplot</a>
<ul>
<li><a href="box-CommandHistory.html">3.1 Getting started</a>
</li><li><a href="sec-first_plots.html">3.2 First plots</a>
</li><li><a href="sect0015.html">3.3 Comments</a>
</li><li><a href="sect0016.html">3.4 Splitting long commands</a>
</li><li><a href="sec-text_escaping.html">3.5 Printing text</a>
</li><li><a href="sec-latex_incompatibility.html">3.6 Axis labels and titles</a>
</li><li><a href="sect0018.html">3.7 Querying the values of settings</a>
</li><li><a href="sec-plot_datafiles.html">3.8 Plotting data files</a>
</li><li><a href="sect0019.html">3.9 Plotting many data files at once</a>
</li><li><a href="sec-replot.html">3.10 The <tt class="tt">replot</tt> command</a>
</li><li><a href="sec-directing_output.html">3.11 Directing where output goes</a>
</li><li><a href="sect0020.html">3.12 Setting the size of output</a>
</li><li><a href="sec-pointtype.html">3.13 Plotting styles</a>
</li><li><a href="ex-axislab.html">3.14 Setting axis ranges</a>
</li><li><a href="sect0021.html">3.15 Interactive help</a>
</li>
</ul>
</li><li><a href="sect0022.html">4 Performing calculations</a>
<ul>
<li><a href="sect0023.html">4.1 Variables</a>
</li><li><a href="sec-constants.html">4.2 Physical constants</a>
</li><li><a href="sec-functions.html">4.3 Functions</a>
</li><li><a href="sec-num_errs.html">4.4 Handling numerical errors</a>
</li><li><a href="sec-complex_numbers.html">4.5 Working with complex numbers</a>
</li><li><a href="sec-units.html">4.6 Working with physical units</a>
</li><li><a href="sec-unitdisp.html">4.7 Configuring how numbers are displayed</a>
</li><li><a href="ex-calculus.html">4.8 Numerical integration and differentiation</a>
</li><li><a href="sect0027.html">4.9 Solving systems of equations</a>
</li><li><a href="ex-eqnsolve.html">4.10 Searching for minima and maxima of functions</a>
</li><li><a href="sec-time_series.html">4.11 Working with time-series data</a>
</li>
</ul>
</li><li><a href="ch-numerics.html">5 Working with data</a>
<ul>
<li><a href="sec-filters.html">5.1 Input filters</a>
</li><li><a href="sect0030.html">5.2 Reading data from a pipe</a>
</li><li><a href="sect0031.html">5.3 Including data within command scripts</a>
</li><li><a href="sec-special_comments.html">5.4 Special comment lines in data files</a>
</li><li><a href="sec-tabulate.html">5.5 Tabulating functions and slicing data files</a>
</li><li><a href="sec-fit_command.html">5.6 Function fitting</a>
</li><li><a href="ex-interpolation.html">5.7 Datafile interpolation</a>
</li><li><a href="sect0033.html">5.8 Fourier transforms</a>
</li><li><a href="sec-histogram.html">5.9 Histograms</a>
</li><li><a href="sect0035.html">5.10 Random data generation</a>
</li>
</ul>
</li><li><a href="chap-progDataTypes.html">6 Programming: Pyxplot’s data types</a>
<ul>
<li><a href="sect0036.html">6.1 Instantiating objects</a>
</li><li><a href="sec-stringvars.html">6.2 Strings</a>
</li><li><a href="sect0041.html">6.3 Lists</a>
</li><li><a href="sect0048.html">6.4 Dictionaries</a>
</li><li><a href="sec-vectors.html">6.5 Vectors and matrices</a>
</li><li><a href="sec-colorObjects.html">6.6 Colors</a>
</li><li><a href="sect0052.html">6.7 Dates</a>
</li><li><a href="sect0053.html">6.8 Modules and classes</a>
</li><li><a href="sect0054.html">6.9 File handles</a>
</li>
</ul>
</li>
</ul>
</li><li><a href="sect0056.html">2 Plotting and Vector Graphics</a>
<ul>
<li><a href="ch-plotting.html">1 Plotting: a complete guide</a>
<ul>
<li><a href="sec-with_modifier.html">1.1 The <tt class="tt">with</tt> modifier</a>
</li><li><a href="sec-list_of_plotstyles.html">1.2 Pyxplot’s plot styles</a>
</li><li><a href="sect0063.html">1.3 Labelling datapoints</a>
</li><li><a href="sect0064.html">1.4 The <tt class="tt">style</tt> keyword</a>
</li><li><a href="sect0065.html">1.5 Plotting functions in exotic styles</a>
</li><li><a href="ex-spirograph.html">1.6 Plotting parametric functions</a>
</li><li><a href="sec-legends.html">1.7 Graph legends</a>
</li><li><a href="sect0066.html">1.8 Configuring axes</a>
</li><li><a href="sec-set_colors.html">1.9 Gridlines</a>
</li><li><a href="sect0071.html">1.10 Clipping behaviour</a>
</li><li><a href="sect0072.html">1.11 Labelling graphs</a>
</li><li><a href="sec-colormaps.html">1.12 Color maps</a>
</li><li><a href="sec-contourmaps.html">1.13 Contour maps</a>
</li><li><a href="sec-threedim.html">1.14 Three-dimensional plotting</a>
</li>
</ul>
</li><li><a href="ch-image_formats.html">2 Producing image files</a>
<ul>
<li><a href="sec-set_terminal.html">2.1 The <tt class="tt">set terminal</tt> command</a>
</li><li><a href="sect0076.html">2.2 The default terminal</a>
</li><li><a href="sect0077.html">2.3 PostScript output</a>
</li><li><a href="sec-file_backup.html">2.4 Backing up over-written files</a>
</li><li><a href="sect0078.html">2.5 Changing font</a>
</li>
</ul>
</li><li><a href="ch-vector_graphics.html">3 Producing vector graphics</a>
<ul>
<li><a href="sect0079.html">3.1 Adding other vector graphics objects</a>
</li><li><a href="sec-multiplot.html">3.2 Multiplot mode</a>
</li><li><a href="sect0080.html">3.3 The <tt class="tt">text</tt> command</a>
</li><li><a href="ex-notice.html">3.4 The <tt class="tt">arrow</tt> and <tt class="tt">line</tt> commands</a>
</li><li><a href="sect0081.html">3.5 Editing items on the canvas</a>
</li><li><a href="sect0084.html">3.6 Linked axes and galleries of plots</a>
</li><li><a href="ex-polygon2.html">3.7 The <tt class="tt">polygon</tt> command</a>
</li><li><a href="sect0086.html">3.8 The <tt class="tt">image</tt> command</a>
</li><li><a href="sect0087.html">3.9 The <tt class="tt">eps</tt> command</a>
</li><li><a href="ex-noentry.html">3.10 The <tt class="tt">box</tt> and <tt class="tt">circle</tt> commands</a>
</li><li><a href="ex-lens.html">3.11 The <tt class="tt">arc</tt> command</a>
</li><li><a href="sec-point.html">3.12 The <tt class="tt">point</tt> command</a>
</li><li><a href="sec-ellipse.html">3.13 The <tt class="tt">ellipse</tt> command</a>
</li><li><a href="sec-piechart.html">3.14 The <tt class="tt">piechart</tt> command</a>
</li><li><a href="sect0088.html">3.15 LaTeX and Pyxplot</a>
</li>
</ul>
</li>
</ul>
</li><li><a href="sect0089.html">3 Reference Manual</a>
<ul>
<li><a href="ch-reference.html">1 Command reference</a>
<ul>
<li><a href="sect0090.html">1.1 ?</a>
</li><li><a href="sect0091.html">1.2 !</a>
</li><li><a href="sect0092.html">1.3 arc</a>
</li><li><a href="sect0093.html">1.4 arrow</a>
</li><li><a href="sect0094.html">1.5 assert</a>
</li><li><a href="sect0095.html">1.6 box</a>
</li><li><a href="sect0096.html">1.7 break</a>
</li><li><a href="sect0097.html">1.8 call</a>
</li><li><a href="sect0098.html">1.9 cd</a>
</li><li><a href="sect0099.html">1.10 circle</a>
</li><li><a href="sect0100.html">1.11 clear</a>
</li><li><a href="sect0101.html">1.12 continue</a>
</li><li><a href="sect0102.html">1.13 delete</a>
</li><li><a href="sect0103.html">1.14 do</a>
</li><li><a href="sect0104.html">1.15 ellipse</a>
</li><li><a href="sect0105.html">1.16 else</a>
</li><li><a href="sect0106.html">1.17 eps</a>
</li><li><a href="sect0107.html">1.18 exec</a>
</li><li><a href="sect0108.html">1.19 exit</a>
</li><li><a href="sect0109.html">1.20 fft</a>
</li><li><a href="sect0110.html">1.21 fit</a>
</li><li><a href="sect0111.html">1.22 for</a>
</li><li><a href="sect0112.html">1.23 foreach</a>
</li><li><a href="sect0113.html">1.24 foreach datum</a>
</li><li><a href="sect0114.html">1.25 global</a>
</li><li><a href="sect0115.html">1.26 help</a>
</li><li><a href="sect0116.html">1.27 histogram</a>
</li><li><a href="sect0117.html">1.28 history</a>
</li><li><a href="sect0118.html">1.29 if</a>
</li><li><a href="sect0119.html">1.30 ifft</a>
</li><li><a href="sect0120.html">1.31 image</a>
</li><li><a href="sect0121.html">1.32 interpolate</a>
</li><li><a href="sect0122.html">1.33 jpeg</a>
</li><li><a href="sect0123.html">1.34 let</a>
</li><li><a href="sect0124.html">1.35 list</a>
</li><li><a href="sect0125.html">1.36 load</a>
</li><li><a href="sect0126.html">1.37 local</a>
</li><li><a href="sect0127.html">1.38 maximize</a>
</li><li><a href="sect0128.html">1.39 minimize</a>
</li><li><a href="sect0129.html">1.40 move</a>
</li><li><a href="sect0130.html">1.41 piechart</a>
</li><li><a href="sect0131.html">1.42 plot</a>
</li><li><a href="sect0136.html">1.43 point</a>
</li><li><a href="sect0137.html">1.44 print</a>
</li><li><a href="sect0138.html">1.45 pwd</a>
</li><li><a href="sect0139.html">1.46 quit</a>
</li><li><a href="sect0140.html">1.47 rectangle</a>
</li><li><a href="sect0141.html">1.48 refresh</a>
</li><li><a href="sect0142.html">1.49 replot</a>
</li><li><a href="sect0143.html">1.50 reset</a>
</li><li><a href="sect0144.html">1.51 save</a>
</li><li><a href="sect0145.html">1.52 set</a>
</li><li><a href="sect0236.html">1.53 show</a>
</li><li><a href="sect0237.html">1.54 solve</a>
</li><li><a href="sect0238.html">1.55 spline</a>
</li><li><a href="sect0239.html">1.56 swap</a>
</li><li><a href="sect0240.html">1.57 tabulate</a>
</li><li><a href="sect0241.html">1.58 text</a>
</li><li><a href="sect0242.html">1.59 undelete</a>
</li><li><a href="sect0243.html">1.60 unset</a>
</li><li><a href="sect0244.html">1.61 while</a>
</li>
</ul>
</li><li><a href="ch-function_list.html">2 List of in-built functions</a>
<ul>
<li><a href="sect0245.html">2.1 The <tt class="ttfamily">ast</tt> module</a>
</li><li><a href="sect0246.html">2.2 The <tt class="ttfamily">colors</tt> module</a>
</li><li><a href="sect0247.html">2.3 The <tt class="ttfamily">exceptions</tt> module</a>
</li><li><a href="sect0248.html">2.4 The <tt class="ttfamily">fractals</tt> module</a>
</li><li><a href="sect0249.html">2.5 The <tt class="ttfamily">os</tt> module</a>
</li><li><a href="sect0250.html">2.6 The <tt class="ttfamily">os.path</tt> module</a>
</li><li><a href="sect0251.html">2.7 The <tt class="ttfamily">phy</tt> module</a>
</li><li><a href="sect0252.html">2.8 The <tt class="ttfamily">random</tt> module</a>
</li><li><a href="sect0253.html">2.9 The <tt class="ttfamily">stats</tt> module</a>
</li><li><a href="sect0254.html">2.10 The <tt class="ttfamily">time</tt> module</a>
</li><li><a href="sec-functions_types.html">2.11 The <tt class="ttfamily">types</tt> module</a>
</li>
</ul>
</li><li><a href="ch-constants.html">3 List of physical constants</a>
</li><li><a href="ch-unit_list.html">4 List of physical units</a>
</li><li><a href="ch-paper_sizes.html">5 List of paper sizes</a>
</li><li><a href="ch-linetypes_table.html">6 Line and point types</a>
</li><li><a href="ch-configuration.html">7 Configuring Pyxplot</a>
<ul>
<li><a href="sect0255.html">7.1 Configuration files</a>
</li><li><a href="sect0256.html">7.2 An example configuration file</a>
</li><li><a href="sect0257.html">7.3 Setting definitions</a>
</li><li><a href="sec-color_names.html">7.4 Recognised color names</a>
</li>
</ul>
</li>
</ul>
</li><li><a href="sect0260.html">4 Appendices</a>
<ul>
<li><a href="sect0261.html">A Other applications of Pyxplot</a>
<ul>
<li><a href="sect0262.html">A.1 Conversion of jpeg images to PostScript</a>
</li><li><a href="sect0263.html">A.2 Inserting equations in Powerpoint presentations</a>
</li><li><a href="sect0264.html">A.3 Delivering talks in Pyxplot</a>
</li>
</ul>
</li><li><a href="ch-gnuplot_diffs.html">B Summary of differences between Pyxplot and gnuplot</a>
<ul>
<li><a href="sect0268.html">B.1 The typesetting of text</a>
</li><li><a href="sect0269.html">B.2 Complex numbers</a>
</li><li><a href="sect0270.html">B.3 The multiplot environment</a>
</li><li><a href="sect0271.html">B.4 Plots with multiple axes</a>
</li><li><a href="sect0272.html">B.5 Plotting parametric functions</a>
</li>
</ul>
</li><li><a href="ch-fit_maths.html">C The <tt class="tt">fit</tt> command: mathematical details</a>
<ul>
<li><a href="sec-bayes_notation.html">C.1 Notation</a>
</li><li><a href="sec-bayes_pdf.html">C.2 The probability density function</a>
</li><li><a href="sect0273.html">C.3 Estimating the error in <img src="images/img-0812.png" alt="$\mathbf{u}^0$" style="vertical-align:0px;
width:19px;
height:16px" class="math gen" /></a>
</li><li><a href="sect0274.html">C.4 The covariance matrix</a>
</li><li><a href="sec-correlation_matrix.html">C.5 The correlation matrix</a>
</li><li><a href="sec-finding_sigmai.html">C.6 Finding <img src="images/img-0800.png" alt="$\sigma _ i$" style="vertical-align:-2px;
width:14px;
height:10px" class="math gen" /></a>
</li>
</ul>
</li><li><a href="sect0275.html">D ChangeLog</a>
<ul>
<li><a href="sect0276.html">2012 Sep 19: Pyxplot 0.9.2</a>
</li><li><a href="sect0277.html">2012 Aug 29: Pyxplot 0.9.1</a>
</li><li><a href="sect0278.html">2012 Aug 1: Pyxplot 0.9.0</a>
</li><li><a href="sect0279.html">2011 Jan 7: Pyxplot 0.8.4</a>
</li><li><a href="sect0280.html">2010 Sep 15: Pyxplot 0.8.3</a>
</li><li><a href="sect0281.html">2010 Aug 4: Pyxplot 0.8.2</a>
</li><li><a href="sect0282.html">2010 Jun 1: Pyxplot 0.8.1</a>
</li><li><a href="sect0283.html">2010 May 19: Pyxplot 0.8.0</a>
</li><li><a href="sect0284.html">2009 Nov 17: Pyxplot 0.7.1</a>
</li><li><a href="sect0285.html">2008 Oct 14: Pyxplot 0.7.0</a>
</li><li><a href="sect0286.html">2007 Feb 26: Pyxplot 0.6.3</a>
</li><li><a href="sect0287.html">2006 Sep 09: Pyxplot 0.5.8</a>
</li>
</ul>
</li><li><a href="sect0288.html">E Index</a>
</li>
</ul>
</li>
</ul>
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