title: Can't load Bioconductor package genomewidesnp6cdf in R
body: <p>New to R and Bioconductor, and I'm working off of code I got from someone else. I do:</p>
  
  <pre><code>source("http://bioconductor.org/biocLite.R")
  
  if (!requireNamespace("BiocManager", quietly = TRUE))
    install.packages("BiocManager")
  BiocManager::install("affy", version = "3.8")
  BiocManager::install("oligo", version = "3.8")
  BiocManager::install("pd.genomewidesnp.6", version = "3.8")
  
  library(Biobase)
  library(affy)
  library(oligo)
  library(pd.genomewidesnp.6)
  
  data &lt;- ReadAffy('myfile.CEL')
  </code></pre>
  
  <p>'myfile.CEL' is a 69 MB .CEL file from a particular project in <a href="https://www.synapse.org/#" rel="nofollow noreferrer">Synapse</a>. Here's what <code>data</code> looks like after loaded into my environment:
  <a href="https://i.stack.imgur.com/mlrYv.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/mlrYv.png" alt="enter image description here"></a></p>
  
  <p>Then if I do <code>eset &lt;- rma(data)</code> I get the error:</p>
  
  <pre><code>Error in (function (classes, fdef, mtable)  : 
    unable to find an inherited method for function ‘rma’ for signature ‘"AffyBatch"’
  </code></pre>
  
  <p>And if I do <code>eset &lt;- affy::rma(data)</code> I get:</p>
  
  <pre><code>Error in getCdfInfo(object) : 
    Could not obtain CDF environment, problems encountered:
  Specified environment does not contain GenomeWideSNP_6
  Library - package genomewidesnp6cdf not installed
  Bioconductor - genomewidesnp6cdf not available
  </code></pre>
  
  <p>Google searches are not telling me what <code>genomewidesnp6cdf</code> is, whether it's the same as <code>pd.genomewidesnp.6</code>, and why I don't have it. Anyone know?</p>