title: Remove/hide figure caption below knitted markdown->pandoc plot
body: <p>I don't know how to remove <code>Figure 1:</code> as seen bellow from the generated pdf document: 
  (using rmarkdown; knitr; pandoc). I have a <code>.Rmd file &gt; .md &gt; .pdf</code></p>
  
  <p>I generate the pdf in R console as:</p>
  
  <pre><code>system(paste("pandoc -V geometry:margin=0.7in -o", path, "/file_name", ".pdf ", "file_Rmd", ".md" ,sep=""))
  </code></pre>
  
  <p>Simple example:</p>
  
  <pre><code>```{r}
  plot(1:20)
  ```
  </code></pre>
  
  <p>Output: </p>
  
  <p><img src="https://i.stack.imgur.com/Ibmcj.jpg" alt="enter image description here"></p>