title: problems with ggtree and ggtreExtra in R
body: <p>I'm following the next example to generate a phylogenetic tree with the next code</p>
  <pre><code>library(ggtreeExtra)
  library(ggtree)
  library(treeio)
  library(ggplot2)
  </code></pre>
  <p>The data are available in: <a href="https://github.com/YuLab-SMU/ggtree/tree/master/inst/examples" rel="nofollow noreferrer">https://github.com/YuLab-SMU/ggtree/tree/master/inst/examples</a></p>
  <pre><code>tree &lt;- read.beast(&quot;examples/MCC_FluA_H3.tree&quot;)
  genotype &lt;- read.table(&quot;examples/Genotype.txt&quot;, sep=&quot;\t&quot;)
  
  colnames(genotype) &lt;- sub(&quot;\\.$&quot;, &quot;&quot;, colnames(genotype))
  genotype$ID &lt;- row.names(genotype)
  
  dat &lt;- reshape2::melt(genotype, id.vars=&quot;ID&quot;, variable.name = &quot;type&quot;, value.name=&quot;genotype&quot;, factorsAsStrings=FALSE)
  dat$genotype &lt;- unlist(lapply(as.vector(dat$genotype),function(x)ifelse(nchar(x)==0,NA,x)))
  </code></pre>
  <p>now the plot</p>
  <pre><code>p &lt;- ggtree(tree) + geom_treescale()
  p2 &lt;- p + geom_fruit(data=dat,
                       geom=geom_tile,
                       mapping=aes(y=ID, x=type, fill=genotype),
                       color=&quot;white&quot;) +
            scale_fill_manual(values=c(&quot;steelblue&quot;, &quot;firebrick&quot;, &quot;darkgreen&quot;),
                              na.translate=FALSE) +
            geom_axis_text(angle=-45, hjust=0, size=1.5) +
            geom_tiplab(align = TRUE, linesize=0, offset = 6, size=2) +
            xlim_tree(xlim=c(0, 36)) +
            scale_y_continuous(limits = c(-1, NA))
  </code></pre>
  <p>my problem is with geom_axis_text, it suppose to be part of ggtreeExtra package, nevertheless I have tried to locate the function but I just cant, this what it say:</p>
  <pre><code>Error in geom_axis_text(angle = -45, hjust = 0, size = 1.5) : 
    could not find function &quot;geom_axis_text&quot;
  </code></pre>
  <p>it is part of a different package ? or how to add labels in the x axis of the heatmap created with geom_fruit or other function</p>