title: How to change dimensions of rChart Iframe in html using RMarkdown?
body: <p>I am trying to incorporate rchart based on nvd3 library in my html documentation generated by RMarkdown. But I am unable to adjust the height of the resulting iframe in my html document.
  As a result of that only half of my plot is visible. is there any solution for this problem using R?. I don't know any html or css. Here is my code chunk producing the plot.</p>
  
  <pre><code>```{r, echo=FALSE,results='asis',comment=NA}
  library(rCharts)
  hair_eye_male &lt;- subset(as.data.frame(HairEyeColor), Sex == "Male")
  n1 &lt;- nPlot(Freq ~ Hair, group = "Eye", data = hair_eye_male, type = "multiBarChart")
  n1$show("iframesrc",cdn=TRUE)
  ```
  </code></pre>
  
  <p>I even tried opening the html file in text editor and editing the <code>width</code> and <code>height</code> options of Iframe in vain.</p>