title: Create a log sequence across multiple orders of magnitude
body: <p>In order to set the custom break intervals for a log scale in a ggplot2 chart, I created the following vector from multiple sequences.</p>
  
  <pre><code>breaks &lt;- c(seq(2000, 10000, by = 1000),
          seq(20000, 100000, by = 10000),
          seq (200000, 1000000, by = 100000),
          seq (2000000,10000000, by = 1000000),
          seq (20000000,100000000, by = 10000000))
  </code></pre>
  
  <p>This is quick and dirty but it gives me the desired breaks from 2,000 to 100,000,000 in log intervals. </p>
  
  <pre><code>&gt; breaks
   [1] 2e+03 3e+03 4e+03 5e+03 6e+03 7e+03 8e+03 9e+03 1e+04 2e+04 3e+04 4e+04
  [13] 5e+04 6e+04 7e+04 8e+04 9e+04 1e+05 2e+05 3e+05 4e+05 5e+05 6e+05 7e+05
  [25] 8e+05 9e+05 1e+06 2e+06 3e+06 4e+06 5e+06 6e+06 7e+06 8e+06 9e+06 1e+07
  [37] 2e+07 3e+07 4e+07 5e+07 6e+07 7e+07 8e+07 9e+07 1e+08
  </code></pre>
  
  <p>How do I clean this snippet of code up to make it more flexible? A search of the many log sequence solutions, existing libraries and my own trial and error was not very fruitful.</p>
  
  <p>Ideally, I would like to input From, To and NumberOfMinorIntervals as parameters into a simpler expression.</p>