title: How to add space between groups of bars in barplot (ggplot)
body: <p>In R ggplot, I need to make a barplot where bars are grouped together based on a factor called "Mode". There should be spacing between each group of bars.</p>
  
  <p>I see in SO that different versions of this problem have come up previously, but the answers provided don't seem to apply to my case.</p>
  
  <p>Here is my data.frame:</p>
  
  <pre><code>&gt; df_mainContributors
                    Top_contributor Eigvec_value Mode
  1         Indonesia Cassava dried    0.3489285    2
  2  China, mainland Sweet potatoes   -0.3280290    2
  3           China, mainland Maize   -0.2848236    2
  4              Indonesia Potatoes   -0.2749160    2
  5             Thailand Cottonseed   -0.3844600    3
  6               Thailand Soybeans    0.3531400    3
  7                 Indonesia Maize    0.3308546    3
  8          China, mainland Millet   -0.2620598    3
  9        China, mainland Potatoes   -0.3883072    4
  10                  Thailand Rice    0.3108829    4
  11   China, mainland Oil, soybean    0.2783780    4
  12        Thailand Sweet potatoes    0.2754683    4
  </code></pre>
  
  <p>Here is my code, where I have tried to implement the answers given <a href="https://stackoverflow.com/questions/25887066/remove-space-between-bars-ggplot2">here</a> and <a href="https://stackoverflow.com/questions/31458536/increase-space-between-bars-in-ggplot">here</a>.</p>
  
  <pre><code>  df_plot &lt;- df_mainContributors
    df_plot$Mode &lt;- as.factor(df_plot$Mode)
    df_plot$Top_contributor &lt;- factor(df_plot$Top_contributor, levels = unique(df_plot$Top_contributor))
    dodge &lt;- position_dodge(width = 0.9)
    ggplot(df_plot, aes(x = Top_contributor, y = Eigvec_value, fill = Mode)) +
      geom_bar(color = "black", stat = "identity", position = dodge, width = 0.9) +
      theme(axis.text.x = element_text(angle = 60, hjust = 1))
  </code></pre>
  
  <p>And here is the no-space-between-groups-having graphic that results:</p>
  
  <p><a href="https://i.stack.imgur.com/wtunr.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/wtunr.png" alt="enter image description here"></a></p>