title: R Barplot with ggplot2 - two categories with different Numeric! values
body: <p>I want to create a specific barplot with ggplot. So far so good, here is what I've got so far:</p>
  
  <pre><code>ggplot(only_savings, aes(DivisionName,  Total_CR)) +
  geom_bar(stat="summary", fun.y="sum")
  </code></pre>
  
  <p><img src="https://i.stack.imgur.com/5baDK.png" alt="Total_CR on Y with 1 bar"></p>
  
  <p>As you can see - there are 2 Divisions: Electrification Products and Power Grinds. On the Y-Axis we have numeric Savings that are summed up (Total_CR - total cost reduction). BUT, I would like to SPLIT the Bar in 2 more parts: Repetitive_Savings and MDF_Savings. So it would look like this: </p>
  
  <p><img src="https://i.stack.imgur.com/oUZrp.png" alt="Total_CR on Y with divided Bars"></p>
  
  <p>And here is the data:
  (Ok, I can't post a screenshot, so I'll paste some rows)</p>
  
  <pre><code>DivisionName                Repetitive_Savings       MDF_Savings    Total_CR
  Power Grids                 86.571656                0              86.571656
  Power Grids                 183.461221               0              183.461221
  Power Grids                 2326.963118              0              2326.963118
  Electrification Products    1249.323277              0              1249.323277
  Electrification Products    6.849336                 0              6.849336
  Electrification Products    3.808845                 0              3.808846
  </code></pre>
  
  <p>DivisionName is a factor, the other 3 are numeric Values. How can I achieve the Barplots that I've sketched in paint? </p>