From: Eric Schulte <schulte.eric@gmail.com>
To: Joe Bogner <joebogner@gmail.com>
Cc: emacs-orgmode@gnu.org
Subject: Re: formatting org-babel output
Date: Wed, 22 May 2013 07:12:41 -0600 [thread overview]
Message-ID: <8761ybrpk5.fsf@gmail.com> (raw)
In-Reply-To: CAEtzV1ZFbMjg3fgYcUMYVUQ2tV5dSiNcE-5yF7w_GYvs3saPfQ@mail.gmail.com
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Joe Bogner <joebogner@gmail.com> writes:
> I am using org-mode and babel with R for reproducible research. I
> would like certain numbers in the output tables to be formatted for
> easier reading - such as eliminating decimals and adding commas for
> readability.
>
> The best I came up with is to use a TBLFM line at the bottom of my
> results table using a function I found on the ElispCookbook on
> emacswiki. A simple example is below that doesn't require R to
> reproduce.
>
> It's a two step process currently to execute the R code in org-babel
> and then jump to the result table TBLFM line and Ctrl+c Ctrl+c to
> format the table
>
> Is there a better way to format table outputs for simple things like
> currency? I would be content if it's only during the org export
> process too
>
You can use the recently introduced :post header argument to
post-process the output of a code block. The following example
demonstrates the use of this argument to apply your number-grouper
function to table output.
[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #2: post-processing.org --]
[-- Type: text/x-org, Size: 1966 bytes --]
#+BEGIN_SRC emacs-lisp :results silent
(defun group-number (num &optional size char)
"Format NUM as string grouped to SIZE with CHAR."
;; Based on code for `math-group-float' in calc-ext.el
(let* ((size (or size 3))
(char (or char ","))
(str (if (stringp num)
(number-to-string (string-to-number
(replace-regexp-in-string "," "" num)))
(number-to-string num)))
(pt (or (string-match "[^0-9a-zA-Z]" str) (length str))))
(while (> pt size)
(setq str (concat (substring str 0 (- pt size))
char
(substring str (- pt size)))
pt (- pt size)))
str))
#+END_SRC
The following code block will call the group-number Emacs Lisp
function on every cell in its input argument which is a number.
#+name: table-number-grouper
#+BEGIN_SRC emacs-lisp :var data='()
(mapcar (lambda (row)
(if (equalp row 'hline) 'hline
(mapcar (lambda (cell) (if (numberp cell) (group-number cell) cell))
row)))
data)
#+END_SRC
Here's a simple shell code block which produces the table (this is a
stand in for your R code block).
#+begin_src sh
cat <<EOF
100000000.55 a
23000 b
3000 c
40004 e
5000 3
EOF
#+end_src
#+RESULTS:
| 100000000.55 | a |
| 23000 | b |
| 3000 | c |
| 40004 | e |
| 5000 | 3 |
Above is the poorly formatted output of your block. Below we add the
"post" header argument to your block, which will use the
"table-number-grouper" code block above to post-process your results.
#+begin_src sh :post table-number-grouper(*this*)
cat <<EOF
100000000.55 a
23000 b
3000 c
40004 e
5000 3
EOF
#+end_src
#+RESULTS:
| 100,000,000.55 | a |
| 23,000 | b |
| 3,000 | c |
| 40,004 | e |
| 5,000 | 3 |
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Cheers,
--
Eric Schulte
http://cs.unm.edu/~eschulte
next prev parent reply other threads:[~2013-05-22 15:58 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-22 11:18 formatting org-babel output Joe Bogner
2013-05-22 13:12 ` Eric Schulte [this message]
2013-05-22 16:27 ` Joe Bogner
2013-05-22 13:14 ` Jay Kerns
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