* Re: empty/nil in table cells
2020-07-09 21:59 ` Nicolas Goaziou
@ 2020-07-09 22:06 ` Mario Frasca
2020-07-10 7:15 ` Michael Brand
2020-07-10 10:11 ` Nicolas Goaziou
2020-07-10 14:27 ` Mario Frasca
1 sibling, 2 replies; 6+ messages in thread
From: Mario Frasca @ 2020-07-09 22:06 UTC (permalink / raw)
To: emacs-orgmode
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I think we really need a bug-tracking mechanism, you know?
see attachment
On 09/07/2020 16:59, Nicolas Goaziou wrote:
> Hello,
>
> Mario Frasca <mario@anche.no> writes:
>
>> I've been experimenting with associating the empty cell with the value
>> nil,
> Where?
>
>> both ways,
> What do you mean?
>
>> and it simplifies a lot writing functions.
> How so?
>
>> also, I've removed the error generation when reading from outside the
>> table (instead of giving up with a user-error, I now get a nil).
> Would you mind explaining?
>
>> it works for me, and I don't see counterindications. is it
>> worthwhile, offering you the patch?
> Thank you. It may be so, but I may be missing some context.
>
> Regards,
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sorry for the messed up setting of the table, trying again, and adding a
web-paste
http://ix.io/2qMC
| date | measure | running avg |
|-------+---------+-------------|
| 01-27 | 604 | |
| 01-28 | 314 | |
| 01-29 | 636 | |
| 01-30 | 305 | |
| 01-31 | 760 | |
| 02-01 | 531 | |
| 02-02 | 331 | 497.29 |
| 02-03 | 77 | 422.00 |
| 02-04 | 621 | 465.86 |
| 02-05 | 406 | 433.00 |
| 02-06 | 621 | 478.14 |
| 02-07 | 975 | 508.86 |
| 02-08 | 252 | 469.00 |
| 02-09 | 794 | 535.14 |
| 02-10 | 36 | 529.29 |
#+TBLFM: $3='(unless (> @# 7) "skipped")
#+TBLFM: $3='(when (> @# 7) (/ (apply #'+ '(@-6$2..$2)) 7.0));N%0.2f
#+TBLFM: $3='(/ (apply #'+ '(@-6$2..$2)) 7.0);N%0.2f::@2$3='(string)::@3$3='(string)::@4$3='(string)::@5$3='(string)::@6$3='(string)::@7$3='(string)
On 03/07/2020 09:53, Mario Frasca wrote:
> hi again,
>
> I haven't found how to solve this, short of removing the evaluation of
> `user-error' from the org-table.el code, or stuffing my TBLFM line
> with field formulas.
>
> a very simple use case: three columns: the date, a daily measurement,
> and a running 4-days average.
>
> | date | measure | running avg ||-------+---------+-------------||
> 01-27 | 604 | skipped || 01-28 | 314 | skipped || 01-29
> | 636 | skipped || 01-30 | 305 | skipped || 01-31 |
> 760 | skipped || 02-01 | 531 | skipped || 02-02 | 331 |
> nil || 02-03 | 77 | nil || 02-04 | 621 | nil || 02-05
> | 406 | nil || 02-06 | 621 | nil || 02-07 | 975 |
> nil || 02-08 | 252 | nil || 02-09 | 794 | nil
> || 02-10 | 36 | nil |#+TBLFM: $3='(unless (> @# 7) "skipped")
> #+TBLFM: $3='(when (> @# 7) (/ (apply #'+ '(@-6$2..$2)) 7.0));N%0.2f
> #+TBLFM: $3='(/ (apply #'+ '(@-6$2..$2))
> 7.0);N%0.2f::@2$3='(string)::@3$3='(string)::@4$3='(string)::@5$3='(string)::@6$3='(string)::@7$3='(string)
>
> the first TBLFM shows you which cells I'm skipping, that is, where I'm
> not applying the @-6 reference. the status of the table results from
> evaluation of that TBLFM line.
>
> the second TBLFM line skips all @-6 references, but still fails with
> the message
>
> user-error: Row descriptor -6 leads outside table
>
> the third TBLFM line "solves" the problem, in one of the ugliestests
> ways.
>
> how would you people approach this?
>
>
> On 29/06/2020 12:03, Mario Frasca wrote:
>> Hi,
>>
>> I need some help understanding how to use org-mode/org-table for
>> references leading outside my table.
>>
>> I have a series of daily figures, and I am computing the series of
>> running sums. column one is the daily data, column two is the
>> running sum of the preceding 14 values from column 1.
>>
>> http://ix.io/2qu7
>>
>> problem is the @-13$1 reference in the function for the second
>> column: it hits a software-generated "user-error: Row descriptor -13
>> leads outside table".
>>
>> this happens even if the formula says (if (> @# 13) (apply '+
>> '(@-13$1..$1)) 0), that is, even if the formula is not evaluated on
>> the cells where the reference does indeed lead out of the table.
>>
>> this happens around line 2809 of org-table.el, inside
>> org-table--row-type
>>
>> I've tried to catch the user-error with a `condition-case', but even
>> there, the error seems to happen before evaluation.
>>
>> I've replaced the `(user-error)' function with a `nil', and it works
>> for me, but that's a very rough measure I'm afraid.
>>
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* Re: empty/nil in table cells
2020-07-09 21:59 ` Nicolas Goaziou
2020-07-09 22:06 ` Mario Frasca
@ 2020-07-10 14:27 ` Mario Frasca
1 sibling, 0 replies; 6+ messages in thread
From: Mario Frasca @ 2020-07-10 14:27 UTC (permalink / raw)
To: emacs-orgmode; +Cc: Michael Brand
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On 09/07/2020 16:59, Nicolas Goaziou wrote:
>> and it simplifies a lot writing functions.
> How so?
thank you Michael, for answering Nicolas' question, in a different and
much structured way than I did in my original message.
the formula you provided —I reduced it slightly, hard coding a constant—
looks like this:
(if (> @# 4) (format "%.2f" (/ (apply '+ (subseq '(@I$2..@II$2) (- @# 1
4) (- @# 1))) 4.0)) ""));N
my impression is this programs in the spreadsheet something that should
be part of the org-table software.
if we let references leading outside the table return 'nil instead of
raising an error, and represent 'nil by the empty string, then this is
enough:
(when (> @# 4) (/ (+ @-3$2..$2) 4.0));L%0.2f
my suggestion is to associate 'nil with empty cells "both ways", in the
sense that a formula returning 'nil causes an empty org-table cell (see
above), and that the empty cell, through the L filter evaluates to nil
and not to the empty string. this for symmetry, and for uniformity with
reference leading outside the table.
regards,
MF
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