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<?xml version="1.0" encoding="ISO-8859-1" standalone="no"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" /><title>5.11. Example - Points Plot with Error Bars</title><link rel="stylesheet" type="text/css" href="phplotdoc.css" /><meta name="generator" content="DocBook XSL Stylesheets V1.78.1" /><link rel="home" href="index.html" title="PHPlot Reference Manual" /><link rel="up" href="examples.html" title="Chapter 5. PHPlot Examples" /><link rel="prev" href="ex-pie3.html" title="5.10. Example - Pie Chart, flat with options" /><link rel="next" href="ex-points2.html" title="5.12. Example - Points Plot / Scatterplot" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">5.11. Example - Points Plot with Error Bars</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ex-pie3.html">Prev</a> </td><th width="60%" align="center">Chapter 5. PHPlot Examples</th><td width="20%" align="right"> <a accesskey="n" href="ex-points2.html">Next</a></td></tr></table><hr /></div><div class="sect1"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="ex-points1"></a>5.11. Example - Points Plot with Error Bars</h2></div></div></div><p>
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This is a point plot with error bars (as indicated by data type
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'data-data-error'). Each point is specified as X value, Y value, Y error
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in the positive direction, and Y error in the negative direction.
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</p><div class="example"><a id="example-points1"></a><p class="title"><strong>Example 5.11. Points Plot with Error Bars</strong></p><div class="example-contents"><div class="informalfigure"><div class="mediaobject"><img src="examples/points1.png" alt="Points Plot with Error Bars Example" /></div></div><pre class="programlisting"><?php
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# PHPlot Example: Point chart with error bars
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require_once 'phplot.php';
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$data = array(
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array('', 1, 23.5, 5, 5), array('', 2, 20.1, 3, 3),
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array('', 3, 19.1, 2, 2), array('', 4, 16.8, 3, 3),
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array('', 5, 18.4, 4, 6), array('', 6, 20.5, 3, 2),
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array('', 7, 23.2, 4, 4), array('', 8, 23.1, 5, 2),
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array('', 9, 24.5, 2, 2), array('', 10, 28.1, 2, 2),
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);
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$plot = new PHPlot(800, 600);
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$plot->SetImageBorderType('plain');
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$plot->SetPlotType('points');
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$plot->SetDataType('data-data-error');
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$plot->SetDataValues($data);
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# Main plot title:
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$plot->SetTitle('Points Plot With Error Bars');
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# Set data range and tick increments to get nice even numbers:
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$plot->SetPlotAreaWorld(0, 0, 11, 40);
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$plot->SetXTickIncrement(1);
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$plot->SetYTickIncrement(5);
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# Draw both grids:
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$plot->SetDrawXGrid(True);
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$plot->SetDrawYGrid(True); # Is default
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# Set some options for error bars:
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$plot->SetErrorBarShape('tee'); # Is default
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$plot->SetErrorBarSize(10);
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$plot->SetErrorBarLineWidth(2);
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# Use a darker color for the plot:
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$plot->SetDataColors('brown');
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$plot->SetErrorBarColors('brown');
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# Make the points bigger so we can see them:
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$plot->SetPointSizes(10);
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$plot->DrawGraph();
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</pre></div></div><br class="example-break" /></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="ex-pie3.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="examples.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="ex-points2.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">5.10. Example - Pie Chart, flat with options </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> 5.12. Example - Points Plot / Scatterplot</td></tr></table></div></body></html>
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