How to show code but hide output in RMarkdown

Question

I want my html file to show the code  but not the output of this chunk       r echo True  include FALSE  fun  lt - function b            for a in b           print a          return a   a         y  lt - fun b        When I run the code  i need the print to see the progress  it is quite a long function in reality    But in the knitr file  I use the output in a further chunk  so I do not want to see it in this one  and there s no notion of progress  since the code has already been run    This echo True  include FALSE here does not work  the whole thing is hidden  which is the normal behavior of include FALSE    What are the parameters I could use to hide the prints  but show my code

User · Answer

For what it s worth       r eval FALSE    The document will display the code by default but will prevent the code block from being executed  and thus will also not display any results

User · Answer

As   J F answered in the comments  using  r echo   T  results    hide      I wanted to expand on their answer - there are great resources you can access to determine all possible options for your chunk and output display - I keep a printed copy at my desk   You can find them either on the RStudio Website under Cheatsheets  look for the R Markdown cheatsheet and R Markdown Reference Guide  or  in RStudio  navigate to the  Help  tab  choose  Cheatsheets   and look for the same documents there   Finally to set default chunk options  you can run  in your first chunk  something like the following code if you want most chunks to have the same behavior       r setup  include FALSE  knitr  opts chunk set echo   T                        results    hide         Later  you can modify the behavior of individual chunks like this  which will replace the default value for just the results option       r analysis  results  markup     code here

User · Answer

For completely silencing the output  here what works for me      r error FALSE  warning FALSE  message FALSE  invisible  capture output       Your code here 2   2   etc etc              The 5 measures used above are   error   FALSE warning   FALSE message   FALSE invisible   capture output

User · Answer

To hide warnings  you can also do   r  warning FALSE

User · Answer

For muting library  name of library   codes  meanly just showing the codes   r loadlib  echo T  results  hide   message F  warning F  is great  And imho a better way than library package  warn conflicts F  quietly T

User · Answer

The results    hide  option doesn t prevent other messages to be printed  To hide them  the following options are useful     r  error FALSE   r  warning FALSE   r  message FALSE    In every case  the corresponding warning  error or message will be printed to the console instead

[r] How to show code but hide output in RMarkdown?

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