title: R markdown, hiding the library output
body: <p>I am working on a <code>rmarkdown</code> presentation. I am trying to show the usage of <code>cast</code> function. However, since the <code>reshape</code> package is necessary, to run the <code>cast</code> function, I need to load reshape library as below.</p>
  
  <pre><code>{r package_options, echo=TRUE}
  library(reshape)
  cast(datam, isim~Ay, value="Sirano")
  </code></pre>
  
  <p>However, after knitting the codes, I face with the output ;
  <a href="https://i.stack.imgur.com/wLPIx.png" rel="noreferrer"><img src="https://i.stack.imgur.com/wLPIx.png" alt="enter image description here"></a></p>
  
  <p>I just need to see the name of the library on the screen which is <code>library(reshape)</code> , and also I want it to be used to run <code>cast</code> function, but I dont want to see the package outputs as shown in the picture.</p>
  
  <p>Would someone help about that?</p>