ction level2">
<h2>GEOquery</h2>
<p>All you need to download data from GEO is the accession number. Let us use <a href="http://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE11675">GSE11675</a> which is a very small scale Affymetrix gene expression array study (6 samples).</p>
<pre class="r"><code>eList &lt;- getGEO(&quot;GSE11675&quot;)
class(eList)</code></pre>
<pre><code>## [1] &quot;list&quot;</code></pre>
<pre class="r"><code>length(eList)</code></pre>
<pre><code>## [1] 1</code></pre>
<pre class="r"><co