Re: Spreadsheet bug?

From: Carsten Dominik <carsten.dominik@gmail.com>
To: Stephan Schmitt <drmabuse@cs.tu-berlin.de>
Cc: emacs-orgmode@gnu.org
Subject: Re: Spreadsheet bug?
Date: Mon, 3 Aug 2009 06:31:18 +0200	[thread overview]
Message-ID: <24CB4D3A-64EE-4E9A-A00B-9C58591C6299@gmail.com> (raw)
In-Reply-To: <4A697CFA.6050001@cs.tu-berlin.de>

On Jul 24, 2009, at 11:20 AM, Stephan Schmitt wrote:

> Andreas Burtzlaff wrote:
>> On Thu, 23 Jul 2009 02:29:30 +0200 meingbg <meingbg@gmail.com> wrote:
>>>> | a |  b | c |
>>>> |---+----+---|
>>>> | a |  2 | 2 |
>>>> | b |  3 | 7 |
>>>> | c | -3 | 4 |
>>>> | d |  5 | 9 |
>>>> #+TBLFM: $3=$2+@-1::@2$3=$2
>>
>
>> If @2$3 is manually set to 2 in the table, then the formulas produce
>> the expected outcome. So, the problem seems to be the order of
>> execution. If column c is cleared and the formulas are executed, @2$3
>> is read to be 0 for the summation and is set to 2 only afterwards.
>> Swapping the order in the TBLFM line doesn't help.
>>
>> Is the order something like field formulas after column formulas?
>> Any chance to influence that?
>
> Evaluating the field formulas before the column formulas is in  
> general a bad
> idea.  Results of the field formulas will always be overwritten by  
> the column
> formulas (if there is a conflict).

When recomputing a table,  Org evaluates field formulas first.
Then it does the column formulas, but never overwrites a field
that was filled with a field formula.

As mentioned elsewhere in this thread

>
> Here you need to evaluate the spreadsheet twice to yield the  
> intended result (I
> get a 5 in field @2$3).

Indeed, this is what is needed here.

- Carsten

>  From info:org:Updating the table:
>
>> `C-u C-u C-c *'
>> `C-u C-u C-c C-c'
>>     Iterate the table by recomputing it until no further changes  
>> occur.
>>     This may be necessary if some computed fields use the value of
>>     other fields that are computed later in the calculation sequence.
>
> hth,
> 	Stephan
>
>
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