Re: [O] NA in R source code block

[Vikas Rawal]

### Solution 1

You could use an elisp function to clear the nil. It is not automatic
and you would have to write a formula for every column but it might
still be better changing them manually.

I don't know how to implement it automatically though. 

#+BEGIN_SRC_elisp
(defun removenil (x)
(interactive)
(replace-regexp-in-string "nil" "" x))
#+END_SRC

I created this export filter which uses something similar but automatically replaces nil with --- on all my documents:

(defun org-export-blanks-filter-latex (row backend info)

  "Replace nil in table with --- in LaTeX export."

  (when (org-export-derived-backend-p backend 'latex)

    (replace-regexp-in-string "nil" "---" row)))

(add-to-list 'org-export-filter-table-row-functions

             'org-export-blanks-filter-latex)

#+NAME: test2
#+BEGIN_SRC R :results value  :exports results :colnames yes :hline yes :dir /tmp  :session R-test1
NA_rep <- function(dt,rep="") {
dt[is.na(dt)] <- rep
return(dt)
}
NA_rep(data.frame(a=c(1,2,NA),b=c("john","dan","marco")))
#+END_SRC

This gets more painful if I want to use something like “—“ in numeric columns.

The first approach/export filter is less painful than this.

Thanks,

Vikas