title: ggplot- Bar chart with multiple variables
body: <p>I am creating a bar chart with three variables, pH, Temp, and Dissolved Oxygen. I would like them to be grouped by date nut am having a hard time getting the chart to be seperate bars with the correct scale. Currently my graph is all over the place. This is what I have so far: </p>
  
  <pre><code>dat.g &lt;- gather(Plaster_2019_Data, type, value, -Date)
  ggplot(dat.g, aes(Date, value)) + 
    geom_bar(aes(fill =Date), stat = 'identity', position = "dodge2") 
  
  </code></pre>
  
  <p>I would like the bars to correspond with pH, Temp, and Dissolved Oxygen and the y axis to be on one scale from 1-30. Any help would be appreciated!</p>
  
  <p>Data: </p>
  
  <pre><code>Date       Surface  pH     Temperature
  May        12.08    8.56    11.16
  May        11.68    8.90    8.76
  June        8.69    9.07    14.65
  June        2.26    7.49    17.51
  July        4.54    7.77    23.82
  July        2.13    8.17    25.29
  August      6.34    8.62    26.50
  September   9.33    9.03    24.31
  September   10.98   8.58    21.02
  September   9.59    8.61    17.33
  October     16.07   8.70    10.39
  October     9.12    8.07    6.38
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/3icge.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/3icge.png" alt="enter image description here"></a></p>