title: Maximum size of matrix heatmap.2 can handle
body: <p>I am trying to use heatmap.2 (RStudio) to generate a heatmap with ~40,000 rows and 7 columns.  The desired purpose for the heatmap is not to see individual row, but instead to see a general trend across the ordered dataset.</p>
  
  <p>This works great when I try a much smaller matrix of 35 rows with 7 columns:</p>
  
  <pre><code>library(gplots)      #need to bring gplots into library, perform each time
  y &lt;- data.matrix(x)  #converting .csv file dataset to a data.matrix
  poy &lt;- colorRampPalette(c("purple", "orange", "yellow")) 
  heatmap.2(y, col=poy, main = "Test2", trace = "none", margins = c(10,12), Rowv = FALSE, Colv = FALSE)
  </code></pre>
  
  <p>But RStudio seems to get hung up with the full 40,000 x 7 data matrix.  I am turning off the dendrogram functions to save processing power and because I do not want the matrix to be re-clustered.</p>
  
  <p>Is this a processing power issue or is heatmap.2 just not designed for such a large matrix?   Thanks!</p>