title: Generating view of cache object in Markdown document in R
body: <p>I cannot show object in markdown document that are objects generated in different R script(within the same session). I would like to point out that I am newbie to markdown. So the code is as follows(''' are added before and after):</p>
  
  <p><code>{r eval=TRUE, echo=FALSE}
  head(output_by_size,10) # 1st line
  summary(cars)           # 2nd line
  dim(iris)               # 3rd line
  </code> </p>
  
  <p>when I comment line 2nd and 3rd the following error is generated:
  Error in head(output_by_size, 10) : object 'output_by_size' not found
  Calls:  ... withCallingHandlers -> withVisible -> eval -> eval -> head</p>
  
  <p>When 1st line is commented, lines 2nd and 3rd work as expected. Output_by_size is just simple data frame object. Could you please help me out?</p>