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```From: Jarmo Hurri <jarmo.hurri@syk.fi>
To: emacs-orgmode@gnu.org
Subject: Re: Preserving the geometry of a table range
Date: Sun, 26 Aug 2012 11:45:50 +0300	[thread overview]
Message-ID: <87harq59dt.fsf@syk.fi> (raw)

Greetings Michael.

I can try. Here is an example of the desired low-level functionality
with a simple function. The lookup functions would be built on this.

Does this help?

* an example of low level functionality
Here is an example of an elisp function working on a range as a list
of rows. This one first finds the product of the elements on each
row, and then sums up these products.
#+BEGIN_SRC emacs-lisp
(defun sum-row-prods (rows)
(apply '+ (mapcar (lambda (row) (apply '* row)) rows)))
#+END_SRC

#+RESULTS:
: sum-row-prods

Then here we have a table in which the element at @4\$1 is given by
applying the function sum-row-prods to a specific list of
lists. This works already in org mode, since in the formula for @4\$1
the list of lists is given as a constant. The formula for @4\$2
illustrates the desired functionality, that is, being able to apply
the function sum-row-prods to range @2\$1..@3\$2. The result should be
#+BEGIN_SRC emacs-lisp
(sum-row-prods '((2 3) (4 5)))
#+END_SRC

#+RESULTS:
: 26

but now it naturally gives an error, since the argument to
sum-row-prods is a list, not a list of lists (rows).

|  a |      b |
|----+--------|
|  2 |      3 |
|  4 |      5 |
| 10 | #ERROR |
#+tblfm: @4\$1='(sum-row-prods '((-4 1) (-2 -7)));N::@4\$2='(sum-row-prods '(@2\$1..@3\$2));N

I don't know what the new syntax for referring to a range as a list
of rows should look like.

--

Jarmo
```

```next prev parent reply	other threads:[~2012-08-26  8:50 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-08-26  6:54 Preserving the geometry of a table range Jarmo Hurri
2012-08-26  7:10 ` Michael Brand
2012-08-26  8:45   ` Jarmo Hurri [this message]
2012-08-26 18:58     ` Michael Brand
2012-08-27 12:33 ` Michael Brand
2012-09-02 14:53   ` Small contrib: lookup (was "Preserving the geometry of a table range") Jarmo Hurri
```

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