---
title: 'Heatmap of count matrix'
output:
    html_document:
      highlight: pygments
---

```{r setup, include=FALSE, warning=FALSE, message=FALSE}
knitr::opts_chunk$set(error = TRUE, echo = FALSE)
```


```{r}
ntd <- normTransform(dds)
select <- order(rowMeans(counts(dds,normalized=TRUE)),
                decreasing=TRUE)[1:20]
df <- as.data.frame(colData(dds)[, -ncol(colData(dds))])
pheatmap(assay(ntd)[select,], annotation_col=df)
```