title: suppress console output in r markdown, but keep plot
body: <p>Hi I have the following markdown chunk:</p>
  
  <pre><code>```{r, echo=FALSE,warning=FALSE,message=FALSE,error=FALSE}
  lapply(obj,function(x) plot(x,main="some plot") box() axis(1,at=seq(0,25,by=1))
  ```
  </code></pre>
  
  <p>The output is multiple plots. However I also get the console message in the pdf document underneath the plots.</p>
  
  <pre><code>&lt;Plot 1&gt; nice plot 1!
  &lt;Plot 2&gt; nice plot 2!
  
  -- nasty horrible console output
  ## [[1]] 
  01.2882829 
  
  ## [[2]]
  120.29393933
  </code></pre>
  
  <p>I have tried echo/warning/error/message = FALSE, but neither of these suppress the console output</p>
  
  <p>please help!</p>