title: Visualize summary-statistics with R
body: <p>My dataset looks similar to the one described here( i have more variables=columns and more observations): </p>
  
  <pre><code>dat=cbind(var1=c(100,20,33,400),var2=c(1,0,1,1),var3=c(0,1,0,0))
  </code></pre>
  
  <p>Now I want to create a bargraph with R where on the x axis one see the names of all the variable, and on the y axis the mean of the respective variable.</p>
  
  <p>As a second task it would be great to show not only the mean, also the standard deviation within the same plot.</p>
  
  <p>It would be nice, solving this with gglopt or qplot.</p>
  
  <p>Thanks</p>