From mboxrd@z Thu Jan  1 00:00:00 1970
From: Nick Dokos <ndokos@gmail.com>
Subject: Re: suppress leading ":" in org-babel output
Date: Mon, 27 May 2019 22:17:46 -0400
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Jeremie Juste <jeremiejuste@gmail.com> writes:

> Hello,
>
> I recall seeing this thread on the mailing list but I cannot find it
> back.
>
> I would like to suppress the first line leading ":" in the following output
>
>
> #+NAME:mean_purchase_per_shopping_trip
>
> #+BEGIN_SRC R :var x=6 :results output :session *R*
> a <-sprintf("%.2f",12.234324)
> cat(a,sep="\n")
> #+END_SRC
>
> #+RESULTS: mean_purchase_per_shopping_trip
> : 
>
> : 12.23
>

FWIW, I just get the last line:

#+NAME:mean_purchase_per_shopping_trip

#+BEGIN_SRC R :var x=6 :results output :session *R*
a <-sprintf("%.2f",12.234324)
cat(a,sep="\n")
#+END_SRC

#+RESULTS:
: 12.23

This is with 

   GNU Emacs 27.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 2.24.32) of 2019-05-01
   Org mode version 9.2.3 (release_9.2.3-367-gd79e80 @ /home/nick/elisp/org-mode/lisp/)
   R version 3.5.3 (2019-03-11) -- "Great Truth"

on Fedora 29.

-- 
Nick

"There are only two hard problems in computer science: cache
invalidation, naming things, and off-by-one errors." -Martin Fowler