title: Plot negative values in logarithmic scale with ggplot 2
body: <p>I need to plot with ggplot2 package in R a graph with some negative values using an x logarithmic scale.</p>
  <p>For example I want to plot these points using an x logarithmic scale</p>
  <pre><code>x &lt;- c(-1,-10,-100)
  y &lt;- c(1,2,3)
  </code></pre>
  <p>I know that the logarithm of a negative value in R produces a NA value, but I need a result like this:</p>
  <p><img src="https://i.stack.imgur.com/fMz9D.png" alt="click to view the picture" /></p>
  <p>Is this possible using ggplot2?</p>