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From: Eric Schulte <schulte.eric@gmail.com>
To: "András Major" <andras.g.major@gmail.com>
Cc: emacs-orgmode@gnu.org
Subject: Re: Wishlist: allow range of table elements to be filled by sbe
Date: Fri, 19 Aug 2011 16:22:40 -0600	[thread overview]
Message-ID: <87vctqbpgg.fsf@gmail.com> (raw)
In-Reply-To: loom.20110819T205313-519@post.gmane.org

Hi András,

András Major <andras.g.major@gmail.com> writes:

> Hi Eric,
>
>> sbe is just an elisp function which is called by the Org-mode
>> spreadsheet's function evaluation mechanisms.  The spreadsheet does not
>> allow for insertion of results into multiple cells and thus neither does
>> the use of sbe.
>
> Hmmm.  It appears that one can make sbe set multiple cells in the
> table -- simply make your code block output multiple results separated
> by "|" and set ":results table".  This, however, also shifts any
> existing cells in the table, thus increasing the number of columns,
> instead of just overwriting the given number of cells.
>
>> I would recommend a solution like the following, which
>> reads the /entire/ table into a code block, and writes the results out
>> in place.
>
> This isn't always practical.  In the case of the Org document I'm
> writing at the moment, the computation is rather expensive, and my
> goal is that you can edit a row in the table and run the calculation
> just for that row to see the result.  Updating the entire table at
> once would be much too slow.
>

Unfortunately I don't believe there is a good solution to this problem.

>
>> Every time the code block is evaluated multiple cells in the table are
>> changed.  To only set specific table values use of the `setf' macro
>> would probably be more appropriate.
>
> How is setf used?  I haven't found it in the documentation.
>

Setf can be used to update internal parts of a data structure, for
example.

#+results: this-is-another-table
| 0 | 0 | 0 |
| 0 | 0 | 0 |
| 0 | 0 | 0 |

#+source: this-is-another-table
#+begin_src emacs-lisp :var table=this-is-another-table
  (setf (nth 1 table) '(2 2 2))
  table
#+end_src

executing the code block will set the second row of the table to all
twos.

Hope this helps -- Eric

>
>   András
>
>
>

-- 
Eric Schulte
http://cs.unm.edu/~eschulte/

next prev parent reply	other threads:[~2011-08-21 18:16 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-08-19  7:22 Wishlist: allow range of table elements to be filled by sbe András Major
2011-08-19 13:17 ` Eric Schulte
2011-08-19 18:59   ` András Major
2011-08-19 22:22     ` Eric Schulte [this message]
2011-08-19 20:46 ` Michael Brand

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