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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"/><title>7&nbsp;Third tutorial</title><link rel="stylesheet" type="text/css" href="scribble.css" title="default"/><link rel="stylesheet" type="text/css" href="racket.css" title="default"/><link rel="stylesheet" type="text/css" href="manual-style.css" title="default"/><link rel="stylesheet" type="text/css" href="manual-racket.css" title="default"/><link rel="stylesheet" type="text/css" href="mb.css" title="default"/><script type="text/javascript" src="scribble-common.js"></script><script type="text/javascript" src="manual-racket.js"></script><!--[if IE 6]><style type="text/css">.SIEHidden { overflow: hidden; }</style><![endif]--></head><body id="scribble-racket-lang-org"><div class="tocset"><div class="tocview"><div class="tocviewlist tocviewlisttopspace"><div class="tocviewtitle"><table cellspacing="0" cellpadding="0"><tr><td style="width: 1em;"><a href="javascript:void(0);" title="Expand/Collapse" class="tocviewtoggle" onclick="TocviewToggle(this,&quot;tocview_0&quot;);">&#9660;</a></td><td></td><td><a href="index.html" class="tocviewlink" data-pltdoc="x">Pollen:<span class="mywbr"> &nbsp;</span> the book is a program</a></td></tr></table></div><div class="tocviewsublisttop" style="display: block;" id="tocview_0"><table cellspacing="0" cellpadding="0"><tr><td align="right">1&nbsp;</td><td><a href="Installation.html" class="tocviewlink" data-pltdoc="x">Installation</a></td></tr><tr><td align="right">2&nbsp;</td><td><a href="quick-tour.html" class="tocviewlink" data-pltdoc="x">Quick tour</a></td></tr><tr><td align="right">3&nbsp;</td><td><a href="Backstory.html" class="tocviewlink" data-pltdoc="x">Backstory</a></td></tr><tr><td align="right">4&nbsp;</td><td><a href="big-picture.html" class="tocviewlink" data-pltdoc="x">The big picture</a></td></tr><tr><td align="right">5&nbsp;</td><td><a href="first-tutorial.html" class="tocviewlink" data-pltdoc="x">First tutorial</a></td></tr><tr><td align="right">6&nbsp;</td><td><a href="second-tutorial.html" class="tocviewlink" data-pltdoc="x">Second tutorial</a></td></tr><tr><td align="right">7&nbsp;</td><td><a href="third-tutorial.html" class="tocviewselflink" data-pltdoc="x">Third tutorial</a></td></tr><tr><td align="right">8&nbsp;</td><td><a href="raco-pollen.html" class="tocviewlink" data-pltdoc="x">Using <span class="stt">raco pollen</span></a></td></tr><tr><td align="right">9&nbsp;</td><td><a href="File_formats.html" class="tocviewlink" data-pltdoc="x">File formats</a></td></tr><tr><td align="right">10&nbsp;</td><td><a href="reader.html" class="tocviewlink" data-pltdoc="x">&#9674; command overview</a></td></tr><tr><td align="right">11&nbsp;</td><td><a href="Module_reference.html" class="tocviewlink" data-pltdoc="x">Module reference</a></td></tr><tr><td align="right">12&nbsp;</td><td><a href="Acknowledgments.html" class="tocviewlink" data-pltdoc="x">Acknowledgments</a></td></tr><tr><td align="right">13&nbsp;</td><td><a href="License___source_code.html" class="tocviewlink" data-pltdoc="x">License &amp; source code</a></td></tr><tr><td align="right"></td><td><a href="doc-index.html" class="tocviewlink" data-pltdoc="x">Index</a></td></tr></table></div></div><div class="tocviewlist"><table cellspacing="0" cellpadding="0"><tr><td style="width: 1em;"><a href="javascript:void(0);" title="Expand/Collapse" class="tocviewtoggle" onclick="TocviewToggle(this,&quot;tocview_1&quot;);">&#9658;</a></td><td>7&nbsp;</td><td><a href="third-tutorial.html" class="tocviewselflink" data-pltdoc="x">Third tutorial</a></td></tr></table><div class="tocviewsublistbottom" style="display: none;" id="tocview_1"><table cellspacing="0" cellpadding="0"><tr><td align="right">7.1&nbsp;</td><td><a href="third-tutorial.html#%28part._tutorial-3._.Prerequisites%29" class="tocviewlink" data-pltdoc="x">Prerequisites</a></td></tr><tr><td align="right">7.2&nbsp;</td><td><a href="third-tutorial.html#%28part._.Pollen_markup_vs__.X.M.L%29" class="tocviewlink" data-pltdoc="x">Pollen markup vs. XML</a></td></tr><tr><td align="right">7.3&nbsp;</td><td
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Pollen won&rsquo;t stop you from calling a function that returns an incompatible value, like <span class="RktSym"><a href="http://docs.racket-lang.org/plot/plotting.html#%28def._%28%28lib._plot%2Fmain..rkt%29._plot%29%29" class="RktValLink" data-pltdoc="x">plot</a></span>, which returns a bitmap image:</p><div class="fileblock"><div class="SIntrapara"><div class="fileblock_filetitle"><span class="fileblock_filename"><span class="stt">"article.html.pm"</span></span></div></div><div class="SIntrapara"><div class="fileblock_filecontent"><div class="SIntrapara"><blockquote class="SCodeFlow"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktMeta">#lang</span><span class="hspace">&nbsp;</span><span class="RktMeta"></span><a href="index.html" class="RktModLink" data-pltdoc="x"><span class="RktSym">pollen</span></a><span class="RktMeta"></span></td></tr><tr><td><span class="RktMeta">&#160;</span></td></tr><tr><td><span class="RktMeta">&#9674;</span><span class="RktPn">(</span><span class="RktSym"><a href="http://docs.racket-lang.org/reference/require.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._require%29%29" class="RktStxLink" data-pltdoc="x">require</a></span><span class="RktMeta"></span><span class="hspace">&nbsp;</span><span class="RktMeta"></span><span class="RktSym">math</span><span class="RktMeta"></span><span class="hspace">&nbsp;</span><span class="RktMeta"></span><span class="RktSym"><a href="http://docs.racket-lang.org/plot/plotting.html#%28def._%28%28lib._plot%2Fmain..rkt%29._plot%29%29" class="RktValLink" data-pltdoc="x">plot</a></span><span class="RktPn">)</span><span class="RktMeta"></span></td></tr><tr><td><span class="RktMeta">&#160;</span></td></tr><tr><td><span class="RktMeta">Here</span><span class="RktVal">'</span><span class="RktMeta">s</span><span class="hspace">&nbsp;</span><span class="RktMeta">a</span><span class="hspace">&nbsp;</span><span class="RktMeta">sine</span><span class="hspace">&nbsp;</span><span class="RktMeta">wave:</span></td></tr><tr><td><span class="RktMeta">&#9674;</span><span class="RktPn">(</span><span class="RktSym"><a href="http://docs.racket-lang.org/plot/plotting.html#%28def._%28%28lib._plot%2Fmain..rkt%29._plot%29%29" class="RktValLink" data-pltdoc="x">plot</a></span><span class="RktMeta"></span><span class="hspace">&nbsp;</span><span class="RktMeta"></span><span class="RktPn">(</span><span class="RktSym"><a href="http://docs.racket-lang.org/plot/renderer2d.html#%28def._%28%28lib._plot%2Fmain..rkt%29._function%29%29" class="RktValLink" data-pltdoc="x">function</a></span><span class="RktMeta"></span><span class="hspace">&nbsp;</span><span class="RktMeta"></span><span class="RktSym"><a href="http://docs.racket-lang.org/reference/generic-numbers.html#%28def._%28%28quote._~23~25kernel%29._sin%29%29" class="RktValLink" data-pltdoc="x">sin</a></span><span class="RktMeta"></span><span class="hspace">&nbsp;</span><span class="RktMeta"></span><span class="RktPn">(</span><span class="RktSym"><a href="http://docs.racket-lang.org/reference/generic-numbers.html#%28def._%28%28quote._~23~25kernel%29._-%29%29" class="RktValLink" data-pltdoc="x"><span class="nobreak">-</span></a></span><span class="RktMeta"></span><span class="hspace">&nbsp;</span><span class="RktMeta"></span><span class="RktSym">pi</span><span class="RktPn">)</span><span class="RktMeta"></span><span class="hspace">&nbsp;</span><span class="RktMeta"></span><span class="RktSym">pi</span><span class="RktMeta"></span><span class="hspace">&nbsp;</span><span class="RktMeta"></span><span class="RktPn">#:label</span><span class="RktMeta"></span><span class="hspace">&nbsp;</span><span class="RktMeta"></span><span class="RktVal">"y</span><span class="hspace">&nbsp;</span><span class="RktVal">=</span><span class="hspace">&nbsp;</span><span class="RktVal">sin(x)"</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktMeta"></span></td></tr></table></blockquote></div></div></div></div><p>But it won&rsquo;t work when you try to run it in DrRacket or load it in the project server.