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<h1 class="title toc-ignore">Combiner plusieurs graphiques</h1>
</div>
<div id="TOC">
<ul>
<li><a href="#plot_grid-cowplot" id="toc-plot_grid-cowplot">plot_grid (cowplot)</a></li>
<li><a href="#patchwork" id="toc-patchwork">patchwork</a></li>
<li><a href="#multiplot-jlutils" id="toc-multiplot-jlutils">multiplot (JLutils)</a></li>
<li><a href="#légende-partagée-entre-plusieurs-graphiques" id="toc-légende-partagée-entre-plusieurs-graphiques">Légende partagée entre plusieurs graphiques</a></li>
</ul>
</div>
<div class="guide-R">
<p>Une version actualisée de ce chapitre est disponible sur <strong>guide-R</strong> : <a href="https://larmarange.github.io/guide-R/analyses/ggplot2.html">Graphiques avec ggplot2</a></p>
</div>
<div class="webin-R">
<p>Ce chapitre est évoqué dans le webin-R #14 (exemples de graphiques avancés - 2) sur <a href="https://youtu.be/iJT46MGSQA8">YouTube</a>.</p>
</div>
<p>Vous savez réaliser des <a href="intro-ggplot2.html">graphiques avec <strong>ggplot2</strong></a> ? Il est très facile de combiner plusieurs graphiques en un seul.</p>
<p>Commençons par créer quelques graphiques avec <code class="pkg">ggplot2</code>.</p>
<div class="sourceCode" id="cb1"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb1-1"><a href="#cb1-1" tabindex="-1"></a><span class="fu">library</span>(ggplot2)</span>
<span id="cb1-2"><a href="#cb1-2" tabindex="-1"></a>p1 <span class="ot"><-</span> <span class="fu">ggplot</span>(mtcars, <span class="fu">aes</span>(wt, mpg)) <span class="sc">+</span></span>
<span id="cb1-3"><a href="#cb1-3" tabindex="-1"></a> <span class="fu">geom_point</span>()</span>
<span id="cb1-4"><a href="#cb1-4" tabindex="-1"></a>p2 <span class="ot"><-</span> <span class="fu">ggplot</span>(mtcars, <span class="fu">aes</span>(<span class="fu">factor</span>(cyl))) <span class="sc">+</span></span>
<span id="cb1-5"><a href="#cb1-5" tabindex="-1"></a> <span class="fu">geom_bar</span>()</span>
<span id="cb1-6"><a href="#cb1-6" tabindex="-1"></a>p3 <span class="ot"><-</span> <span class="fu">ggplot</span>(mtcars, <span class="fu">aes</span>(<span class="fu">factor</span>(cyl), mpg)) <span class="sc">+</span></span>
<span id="cb1-7"><a href="#cb1-7" tabindex="-1"></a> <span class="fu">geom_violin</span>()</span>
<span id="cb1-8"><a href="#cb1-8" tabindex="-1"></a>p4 <span class="ot"><-</span> <span class="fu">ggplot</span>(mtcars, <span class="fu">aes</span>(<span class="fu">factor</span>(cyl), mpg)) <span class="sc">+</span></span>
<span id="cb1-9"><a href="#cb1-9" tabindex="-1"></a> <span class="fu">geom_boxplot</span>()</span></code></pre></div>
<div id="plot_grid-cowplot" class="section level2 hasAnchor">
<h2 class="hasAnchor">plot_grid (cowplot)<a href="#plot_grid-cowplot" class="anchor-section" aria-label="Anchor link to header"></a></h2>
<p>L’extension <code class="pkg">cowplot</code> propose une fonction <code data-pkg="cowplot">plot_grid</code>. Son usage est expliqué en détail dans les vignettes dédiées inclues avec l’extension : <a href="https://wilkelab.org/cowplot/" class="uri">https://wilkelab.org/cowplot/</a>.</p>
<div class="sourceCode" id="cb2"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb2-1"><a href="#cb2-1" tabindex="-1"></a><span class="fu">library</span>(cowplot)</span></code></pre></div>
<pre><code>
Attachement du package : 'cowplot'</code></pre>
<pre><code>L'objet suivant est masqué depuis 'package:ggpubr':
get_legend</code></pre>
<pre><code>L'objet suivant est masqué depuis 'package:lubridate':
stamp</code></pre>
<pre><code>L'objet suivant est masqué depuis 'package:JLutils':
get_legend</code></pre>
<div class="sourceCode" id="cb7"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb7-1"><a href="#cb7-1" tabindex="-1"></a><span class="co"># simple grid</span></span>
<span id="cb7-2"><a href="#cb7-2" tabindex="-1"></a><span class="fu">plot_grid</span>(p1, p2, p3, p4)</span></code></pre></div>
<p><img src="graphs/combiner-plusieurs-graphiques/unnamed-chunk-2-1.png" width="1050" /></p>
<div class="sourceCode" id="cb8"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb8-1"><a href="#cb8-1" tabindex="-1"></a><span class="co"># simple grid with labels and aligned plots</span></span>
<span id="cb8-2"><a href="#cb8-2" tabindex="-1"></a><span class="fu">plot_grid</span>(p1, p2, p3, p4, <span class="at">labels =</span> <span class="fu">c</span>(<span class="st">"A"</span>, <span class="st">"B"</span>, <span class="st">"C"</span>, <span class="st">"D"</span>), <span class="at">align =</span> <span class="st">"hv"</span>)</span></code></pre></div>
<p><img src="graphs/combiner-plusieurs-graphiques/unnamed-chunk-2-2.png" width="1050" /></p>
<div class="sourceCode" id="cb9"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb9-1"><a href="#cb9-1" tabindex="-1"></a><span class="co"># manually setting the number of rows, auto-generate upper-case labels</span></span>
<span id="cb9-2"><a href="#cb9-2" tabindex="-1"></a><span class="fu">plot_grid</span>(p1, p2, p3, <span class="at">nrow =</span> <span class="dv">3</span>, <span class="at">labels =</span> <span class="st">"AUTO"</span>, <span class="at">label_size =</span> <span class="dv">12</span>, <span class="at">align =</span> <span class="st">"v"</span>)</span></code></pre></div>
<p><img src="graphs/combiner-plusieurs-graphiques/unnamed-chunk-2-3.png" width="1050" /></p>
<div class="sourceCode" id="cb10"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb10-1"><a href="#cb10-1" tabindex="-1"></a><span class="co"># making rows and columns of different widths/heights</span></span>
<span id="cb10-2"><a href="#cb10-2" tabindex="-1"></a><span class="fu">plot_grid</span>(p1, p2, p3, p4, <span class="at">align =</span> <span class="st">"hv"</span>, <span class="at">rel_heights =</span> <span class="fu">c</span>(<span class="dv">2</span>, <span class="dv">1</span>), <span class="at">rel_widths =</span> <span class="fu">c</span>(<span class="dv">1</span>, <span class="dv">2</span>))</span></code></pre></div>
<p><img src="graphs/combiner-plusieurs-graphiques/unnamed-chunk-2-4.png" width="1050" /></p>
<p>On notera en passant que le chargement de <code class="pkg">cowplot</code> modifie le style par défaut des graphiques <code class="pkg">ggplot2</code>. Voir <a href="https://cran.r-project.org/web/packages/cowplot/vignettes/introduction.html" class="uri">https://cran.r-project.org/web/packages/cowplot/vignettes/introduction.html</a>.</p>
</div>
<div id="patchwork" class="section level2 hasAnchor">
<h2 class="hasAnchor">patchwork<a href="#patchwork" class="anchor-section" aria-label="Anchor link to header"></a></h2>
<p>Citons également l’extension <code class="pkg">patchwork</code>, disponible sur GitHub (<a href="https://github.com/thomasp85/patchwork" class="uri">https://github.com/thomasp85/patchwork</a>) qui propose une syntaxe un petit peu différente, par <q>addition</q> de graphiques.</p>
<div class="sourceCode" id="cb11"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb11-1"><a href="#cb11-1" tabindex="-1"></a><span class="fu">library</span>(patchwork)</span></code></pre></div>
<pre><code>
Attachement du package : 'patchwork'</code></pre>
<pre><code>L'objet suivant est masqué depuis 'package:cowplot':
align_plots</code></pre>
<div class="sourceCode" id="cb14"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb14-1"><a href="#cb14-1" tabindex="-1"></a>p1 <span class="sc">+</span> (p2 <span class="sc">+</span> p3) <span class="sc">+</span> p4 <span class="sc">+</span> <span class="fu">plot_layout</span>(<span class="at">ncol =</span> <span class="dv">1</span>)</span></code></pre></div>
<p><img src="graphs/combiner-plusieurs-graphiques/unnamed-chunk-3-1.png" width="1050" /></p>
</div>
<div id="multiplot-jlutils" class="section level2 hasAnchor">
<h2 class="hasAnchor">multiplot (JLutils)<a href="#multiplot-jlutils" class="anchor-section" aria-label="Anchor link to header"></a></h2>
<p>Dans son ouvrage <em>Cookbook for R</em>, Winston Chang propose une fonction <code data-pkg="JLutils">multiplot</code> pour combiner plusieurs graphiques<a href="#fn1" class="footnote-ref" id="fnref1"><sup>1</sup></a></p>
<p>L’extension <code class="pkg">JLutils</code> disponible sur <a href="https://github.com/larmarange/JLutils">GitHub</a> propose une version améliorée de cette fonction.</p>
<p>Pour installer <code class="pkg">JLutils</code> si non disponible sur votre PC, copier/coller le code ci-dessous.</p>
<div class="sourceCode" id="cb15"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb15-1"><a href="#cb15-1" tabindex="-1"></a><span class="cf">if</span> (<span class="sc">!</span><span class="fu">require</span>(devtools)) {</span>
<span id="cb15-2"><a href="#cb15-2" tabindex="-1"></a> <span class="fu">install.packages</span>(<span class="st">"devtools"</span>)</span>
<span id="cb15-3"><a href="#cb15-3" tabindex="-1"></a> <span class="fu">library</span>(devtools)</span>
<span id="cb15-4"><a href="#cb15-4" tabindex="-1"></a>}</span>
<span id="cb15-5"><a href="#cb15-5" tabindex="-1"></a><span class="fu">install_github</span>(<span class="st">"larmarange/JLutils"</span>)</span></code></pre></div>
<p>Parce que quelques exemples valent mieux qu’un long discours.</p>
<div class="sourceCode" id="cb16"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb16-1"><a href="#cb16-1" tabindex="-1"></a><span class="fu">library</span>(JLutils)</span>
<span id="cb16-2"><a href="#cb16-2" tabindex="-1"></a><span class="fu">multiplot</span>(p1, p2, p3, p4)</span></code></pre></div>
<p><img src="graphs/combiner-plusieurs-graphiques/unnamed-chunk-5-1.png" width="1050" /></p>
<div class="sourceCode" id="cb17"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb17-1"><a href="#cb17-1" tabindex="-1"></a><span class="fu">multiplot</span>(p1, p2, p3, p4, <span class="at">cols =</span> <span class="dv">2</span>)</span></code></pre></div>
<p><img src="graphs/combiner-plusieurs-graphiques/unnamed-chunk-5-2.png" width="1050" /></p>
<div class="sourceCode" id="cb18"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb18-1"><a href="#cb18-1" tabindex="-1"></a><span class="fu">multiplot</span>(p1, p2, p3, <span class="at">layout =</span> <span class="fu">matrix</span>(<span class="fu">c</span>(<span class="dv">1</span>, <span class="dv">2</span>, <span class="dv">3</span>, <span class="dv">3</span>), <span class="at">nrow =</span> <span class="dv">2</span>))</span></code></pre></div>
<p><img src="graphs/combiner-plusieurs-graphiques/unnamed-chunk-5-3.png" width="1050" /></p>
<div class="sourceCode" id="cb19"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb19-1"><a href="#cb19-1" tabindex="-1"></a><span class="fu">multiplot</span>(p1, p2, p3, <span class="at">layout =</span> <span class="fu">matrix</span>(<span class="fu">c</span>(<span class="dv">1</span>, <span class="dv">2</span>, <span class="dv">3</span>, <span class="dv">3</span>), <span class="at">nrow =</span> <span class="dv">2</span>, <span class="at">byrow =</span> <span class="cn">TRUE</span>))</span></code></pre></div>
<p><img src="graphs/combiner-plusieurs-graphiques/unnamed-chunk-5-4.png" width="1050" /></p>
<div class="sourceCode" id="cb20"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb20-1"><a href="#cb20-1" tabindex="-1"></a><span class="fu">multiplot</span>(p1, p2, p3, <span class="at">layout =</span> <span class="fu">matrix</span>(<span class="fu">c</span>(<span class="dv">1</span>, <span class="dv">2</span>, <span class="dv">3</span>, <span class="dv">3</span>), <span class="at">nrow =</span> <span class="dv">2</span>, <span class="at">byrow =</span> <span class="cn">TRUE</span>), <span class="at">heights =</span> <span class="fu">c</span>(<span class="dv">3</span>, <span class="dv">1</span>))</span></code></pre></div>
<p><img src="graphs/combiner-plusieurs-graphiques/unnamed-chunk-5-5.png" width="1050" /></p>
</div>
<div id="légende-partagée-entre-plusieurs-graphiques" class="section level2 hasAnchor">
<h2 class="hasAnchor">Légende partagée entre plusieurs graphiques<a href="#légende-partagée-entre-plusieurs-graphiques" class="anchor-section" aria-label="Anchor link to header"></a></h2>
<p><code class="pkg">JLutils</code> et <code class="pkg">cowplot</code> fournissent tous deux une fonction <code data-pkg="cowplot">get_legend</code> permettant d’extraire la légende d’un graphique puis de l’utiliser avec <code data-pkg="JLutils">multiplot</code> ou <code data-pkg="cowplot">plot_grid</code>.</p>
<p>Créons quelques graphiques.</p>
<div class="sourceCode" id="cb21"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb21-1"><a href="#cb21-1" tabindex="-1"></a>dsamp <span class="ot"><-</span> diamonds[<span class="fu">sample</span>(<span class="fu">nrow</span>(diamonds), <span class="dv">1000</span>), ]</span>
<span id="cb21-2"><a href="#cb21-2" tabindex="-1"></a>p1 <span class="ot"><-</span> <span class="fu">qplot</span>(carat, price, <span class="at">data =</span> dsamp, <span class="at">colour =</span> clarity) <span class="sc">+</span></span>
<span id="cb21-3"><a href="#cb21-3" tabindex="-1"></a> <span class="fu">theme</span>(<span class="at">plot.margin =</span> <span class="fu">unit</span>(<span class="fu">c</span>(<span class="dv">6</span>, <span class="dv">0</span>, <span class="dv">6</span>, <span class="dv">0</span>), <span class="st">"pt"</span>))</span></code></pre></div>
<pre><code>Warning: `qplot()` was deprecated in ggplot2 3.4.0.</code></pre>
<div class="sourceCode" id="cb23"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb23-1"><a href="#cb23-1" tabindex="-1"></a>p2 <span class="ot"><-</span> <span class="fu">qplot</span>(depth, price, <span class="at">data =</span> dsamp, <span class="at">colour =</span> clarity) <span class="sc">+</span></span>
<span id="cb23-2"><a href="#cb23-2" tabindex="-1"></a> <span class="fu">theme</span>(<span class="at">plot.margin =</span> <span class="fu">unit</span>(<span class="fu">c</span>(<span class="dv">6</span>, <span class="dv">0</span>, <span class="dv">6</span>, <span class="dv">0</span>), <span class="st">"pt"</span>)) <span class="sc">+</span> <span class="fu">ylab</span>(<span class="st">""</span>)</span>
<span id="cb23-3"><a href="#cb23-3" tabindex="-1"></a>p3 <span class="ot"><-</span> <span class="fu">qplot</span>(color, price, <span class="at">data =</span> dsamp, <span class="at">colour =</span> clarity) <span class="sc">+</span></span>
<span id="cb23-4"><a href="#cb23-4" tabindex="-1"></a> <span class="fu">theme</span>(<span class="at">plot.margin =</span> <span class="fu">unit</span>(<span class="fu">c</span>(<span class="dv">6</span>, <span class="dv">0</span>, <span class="dv">6</span>, <span class="dv">0</span>), <span class="st">"pt"</span>)) <span class="sc">+</span> <span class="fu">ylab</span>(<span class="st">""</span>)</span></code></pre></div>
<p>Récupérons la légende du premier graphique graphique puis supprimons là dans les trois graphiques.</p>
<div class="sourceCode" id="cb24"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb24-1"><a href="#cb24-1" tabindex="-1"></a>leg <span class="ot"><-</span> <span class="fu">get_legend</span>(p1)</span>
<span id="cb24-2"><a href="#cb24-2" tabindex="-1"></a>p1 <span class="ot"><-</span> p1 <span class="sc">+</span> <span class="fu">theme</span>(<span class="at">legend.position =</span> <span class="st">"none"</span>)</span>
<span id="cb24-3"><a href="#cb24-3" tabindex="-1"></a>p2 <span class="ot"><-</span> p2 <span class="sc">+</span> <span class="fu">theme</span>(<span class="at">legend.position =</span> <span class="st">"none"</span>)</span>
<span id="cb24-4"><a href="#cb24-4" tabindex="-1"></a>p3 <span class="ot"><-</span> p3 <span class="sc">+</span> <span class="fu">theme</span>(<span class="at">legend.position =</span> <span class="st">"none"</span>)</span></code></pre></div>
<p>Combinons le tout.</p>
<div class="sourceCode" id="cb25"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb25-1"><a href="#cb25-1" tabindex="-1"></a><span class="fu">multiplot</span>(p1, p2, p3, leg, <span class="at">cols =</span> <span class="dv">2</span>)</span></code></pre></div>
<p><img src="graphs/combiner-plusieurs-graphiques/unnamed-chunk-8-1.png" width="1050" /></p>
<div class="sourceCode" id="cb26"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb26-1"><a href="#cb26-1" tabindex="-1"></a><span class="fu">plot_grid</span>(p1, p2, p3, leg, <span class="at">ncol =</span> <span class="dv">2</span>)</span></code></pre></div>
<p><img src="graphs/combiner-plusieurs-graphiques/unnamed-chunk-8-2.png" width="1050" /></p>
<p>Enfin, citons également la fonction <code data-pkg="lemeon">grid_arrange_shared_legend</code> de l’extension <code class="pkg">lemon</code><a href="#fn2" class="footnote-ref" id="fnref2"><sup>2</sup></a>.</p>
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<li id="fn1"><p>Voir <a href="http://www.cookbook-r.com/Graphs/Multiple_graphs_on_one_page_(ggplot2)/" class="uri">http://www.cookbook-r.com/Graphs/Multiple_graphs_on_one_page_(ggplot2)/</a>.<a href="#fnref1" class="footnote-back">↩︎</a></p></li>
<li id="fn2"><p><code>lemon</code> fournit également diverses fonctions pour manipuler des graphiques <code class="pkg">ggplot2</code>, comme par exemple la possibilité de répéter les axes quand on utilise des facettes.<a href="#fnref2" class="footnote-back">↩︎</a></p></li>
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