From: Carsten Dominik <carsten.dominik@gmail.com>
To: Michael Brand <michael.brand@alumni.ethz.ch>
Cc: Org Mode <emacs-orgmode@gnu.org>
Subject: Re: new spreadsheet features: field coordinates, multi line TBLFM with comments
Date: Sun, 14 Mar 2010 11:06:07 +0100 [thread overview]
Message-ID: <24E1A3E6-3F21-432B-801A-56726F002155@gmail.com> (raw)
In-Reply-To: <4B9BAED2.8000600@alumni.ethz.ch>
Hi Michael,
On Mar 13, 2010, at 4:27 PM, Michael Brand wrote:
> Hi Carsten, hi all
>
> 1) field coordinates:
> As a proposal I implemented the following to cover one of my
> spreadsheet use cases: Why not let `@#' and `$#' in Calc formulas
> (works also for Lisp formulas) be substituted to the row or column
> number of the formula result field?. The traditional Lisp formula
> equivalents are org-table-current-dline and org-table-current-
> column. I believe it does not break the TBLFM syntax for any other
> use.
>
> My use case is an overview with the average annual relative changes
> of a time series. Here is an example with averages for a history of
> 1 year up to 4 years:
> | year | quote | 1 a | 2 a | 3 a | 4 a |
> |------+-------+-------+-------+-------+-------|
> | 2005 | 10 | | | | |
> | 2006 | 12 | 0.200 | | | |
> | 2007 | 14 | 0.167 | 0.183 | | |
> | 2008 | 16 | 0.143 | 0.155 | 0.170 | |
> | 2009 | 18 | 0.125 | 0.134 | 0.145 | 0.158 |
> #+TBLFM: $3 = if(@# + 1 > $#, ($2 / subscr(@-I$2..@+I$2, @# + 1 -
> $#)) ^ (1 / ($# - 2)) - 1, string("")); f3 :: $4 = if(@# + 1 > $#,
> ($2 / subscr(@-I$2..@+I$2, @# + 1 - $#)) ^ (1 / ($# - 2)) - 1,
> string("")); f3 :: $5 = if(@# + 1 > $#, ($2 / subscr(@-I$2..@+I$2,
> @# + 1 - $#)) ^ (1 / ($# - 2)) - 1, string("")); f3 :: $6 = if(@# +
> 1 > $#, ($2 / subscr(@-I$2..@+I$2, @# + 1 - $#)) ^ (1 / ($# - 2)) -
> 1, string("")); f3
>
> The patch (the files with `---' were taken from org-version 6.34c):
> ======================================================================
> --- a/doc/org.texi
> +++ b/doc/org.texi
> @@ -2098,6 +2098,21 @@ table in that entry. REF is an absolute
> described above for example @code{@@3$3} or @code{$somename}, valid
> in the
> referenced table.
>
> +@subsubheading Field coordinates
> +@cindex field coordinates
> +@cindex coordinates, of field
> +@cindex row, of field coordinates
> +@cindex column, of field coordinates
> +
> +For Calc formulas and Lisp formulas @code{@@#} and @code{$#} can be
> used to
> +get the row or column number of the field where the formula result
> goes.
> +The traditional Lisp formula equivalents are @code{org-table-
> current-dline}
> +and @code{org-table-current-column}. Example:
> +
> +@example
> +if(@@# % 2, $#, string("")) @r{column number on odd lines only}
> +@end example
> +
> @node Formula syntax for Calc, Formula syntax for Lisp, References,
> The spreadsheet
> @subsection Formula syntax for Calc
> @cindex formula syntax, Calc
> --- a/lisp/org-table.el
> +++ b/lisp/org-table.el
> @@ -2243,6 +2243,21 @@ not overwrite the stored one."
> (setq form (copy-sequence formula)
> lispp (and (> (length form) 2)(equal (substring form 0 2)
> "'(")))
> (if (and lispp literal) (setq lispp 'literal))
> +
> + ;; Insert row number of formula result field
> + (while (string-match "\\@#" form)
> + (setq form
> + (replace-match
> + (save-match-data
> + (format "%d" (org-table-current-dline)))
> + t t form)))
> + ;; Insert column number of formula result field
> + (while (string-match "\\$#" form)
> + (setq form
> + (replace-match
> + (save-match-data
> + (format "%d" (org-table-current-column)))
> + t t form)))
> ;; Check for old vertical references
> (setq form (org-table-rewrite-old-row-references form))
> ;; Insert remote references
> ======================================================================
That does look reasonable, and I am going to take that patch.
>
> 2) self-edited multi line TBLFM with comments:
> For me it would be great to have the now missing option to hack all
> the formulas myself just directly, but rather into a multi line
> TBLFM with comments than into the one line #+TBLFM:. For the use
> case above this would look like:
Before looking further, I would like to find out if you are aware
of the existence of the formula editior, invoked the command
C-c ' (that is C-c followed by the single quote) while the
cursor is in a table.
The formula editor does not have comments, but otherwise it is more
powerful than what you propose.
- Carsten
>
> [...]
> | 2009 | 18 | 0.125 | 0.134 | 0.145 | 0.158 |
> #+BEGIN_TBLFM
> $3 = if(@# + 1 > $#, ($2 / subscr(@-I$2..@+I$2, @# + 1 - $#)) ^
> (1 / ($# - 2)) - 1, string("")); f3 :: # rel. change for 1 year
> $4 = if(@# + 1 > $#, ($2 / subscr(@-I$2..@+I$2, @# + 1 - $#)) ^
> (1 / ($# - 2)) - 1, string("")); f3 :: # average for 2 years
> $5 = if(@# + 1 > $#, ($2 / subscr(@-I$2..@+I$2, @# + 1 - $#)) ^
> (1 / ($# - 2)) - 1, string("")); f3 :: # average for 3 years
> $6 = if(@# + 1 > $#, ($2 / subscr(@-I$2..@+I$2, @# + 1 - $#)) ^
> (1 / ($# - 2)) - 1, string("")); f3 # average for 4 years
> #+END_TBLFM
>
> I suggest to leave the one line #+TBLFM without the comment
> possibility to avoid issues with the very nice write back to #+TBLFM
> when editing with e. g. `C-c =' or moving rows and columns. In favor
> of a complexity reduction and to avoid confusion I suggest to leave
> the #+BEGIN_TBLFM option without write back and to unconditionally
> reject a trial to do it. Similar to the nice reject when trying to
> edit column 1 with `C-c =' in the following example, where #+TBLFM
> has been upset by self-editing it:
> | 0 |
> #+TBLFM: $1 = 0 :: $1 = 0
>
> This way the implementation for the multi line TBLFM with comments
> could on evaluation simply strip the comments from all the lines
> between #+BEGIN_TBLFM and #+END_TBLFM, join the rest of these lines
> into one line and pass it to where the #+TBLFM: content is passed
> today. Of course there would still be more to do to make the whole
> work.
>
> Surprise: #+BEGIN_TBLFM already folds by TAB without implementing
> anything yet.
>
> <side_note on comments>
> The TBLFM comments should not be parsed as `#' but rather ` #' in
> order to not break
> a) the new field coordinates `@#' and `$#' if done as in my proposal
> above
> b) the Calc input radix
>
> Example:
> | (1, 1) | (1, 2) | 256 |
> #+BEGIN_TBLFM
> $1 = (@#, $#) :: $2 = (@#, $#) :: # a) numbers of row and column
> $3 = 16#100 # b) Calc input radix with hash char
> #+END_TBLFM
>
> I'm not sure if adding a regexp for multi line TBLFM comments to
> some face for highlighting would make too much trouble with breaking
> other stuff containing ` #' outside multi line TBLFM.
> </side_note>
>
> How easy would that be to implement?
>
> Michael
- Carsten
next prev parent reply other threads:[~2010-03-14 10:06 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-13 15:27 new spreadsheet features: field coordinates, multi line TBLFM with comments Michael Brand
2010-03-14 10:06 ` Carsten Dominik [this message]
2010-03-14 11:51 ` Michael Brand
2010-03-14 12:13 ` Carsten Dominik
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