title: How can I change axis' scale(or intervals)?
body: <p>I would like to adjust axis' scale (or intervals). <br/><br/>
  On the other hand, I have some trouble with it.<br/><br/>
  Here's my code what I've implemented as below.</p>
  
  <pre><code>install.packages("randomForestSRC")
  install.packages("ggRandomForests")
  
  library(randomForestSRC)
  library(ggRandomForests)
  
  data(pbc, package="randomForestSRC") 
  pbc.na &lt;- na.omit(pbc)
  
  set.seed(123) 
  rsf &lt;- rfsrc(Surv(days, status)~., data=pbc.na,     
               ntree=500, nplist=1, importance=T, proximity=T)
  
  out.vs &lt;- var.select (rsf)
  gg_md &lt;- gg_minimal_depth(out.vs)
  </code></pre>
  
  <p>In that case, the graph can be shown like this. </p>
  
  <p><a href="https://i.stack.imgur.com/0amRf.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/0amRf.png" alt="enter image description here"></a></p>
  
  <p>However, What I want to do is that adjusting x-axis scale from 0 to 22 by 1. <br/><br/>
  So although I've conducted the added code as below, it didn't work.</p>
  
  <pre><code>install.packages("tidyverse")
  library(tidyverse)
  
  ggplot2::ggplot(gg_md, ggplot2::aes(x=varselect$depth, y=reorder(md.obj$count, varselect$depth))) + 
    ggplot2::geom_point() +
    ggplot2::scale_x_continuous(breaks=1:22, labels=1:22) +
    ggplot2::geom_abline(slope=1, lty=2, color="red") +
    ggplot2::geom_hline(xintercept = attr(gg_md, "modelsize") + .5, lty=2, color="black")+
    ggplot2::theme_bw()
  </code></pre>
  
  <p>Please let me know how to do what I want to. <br/><br/>
  Thanks always.</p>