Re: [O] [BUG] org-table: time difference delivers wrong results

[Daniel Bausch]

What may be a leading hint is that even

| -28799 | -08:00:01 |
#+TBLFM: $2=$1;T

does not deliver correct results.  It should deliver -07:59:59.

Daniel

Am Mittwoch 23. November 2011, 11:23:49 schrieb Nick Dokos:
> Martyn Jago <address@hidden> wrote:
> > Martyn Jago <address@hidden> writes:
> > 
> > Apologies I had a typo - please ignore the previous mail. So this looks 
more sensible:
> > > Daniel Bausch <address@hidden> writes:
> > >> Anyone?  It might be a duplicate of what Gustav Wiktrom reported on
> > >> 1st of September, but his problem was not resolved, either.
> > >> 
> > >> Daniel
> > >> 
> > >> Am Dienstag 15. November 2011, 22:12:45 schrieb Daniel Bausch:
> > >>> Hello list,
> > >>> 
> > >>> consider the following example:
> > >>> |        A |         B |         C |
> > >>> |
> > >>> |----------+-----------+-----------|
> > >>> |
> > >>> | 07:11:00 | -08:00:00 | -01:11:00 |
> > >>> 
> > >>> #+TBLFM: $3=$1+$2;T
> > > 
> > > [...]
> > > 
> > |   Data 1 |   Data 2 |     Total |
> > |
> > |----------+----------+-----------|
> > |
> > | 00:00:00 | 00:00:00 |  00:00:00 |
> > | 00:00:00 | 00:00:01 | -01:59:59 |
> > | 00:00:00 | 00:00:02 | -01:59:58 |
> > | 00:00:00 | 00:00:03 | -01:59:57 |
> > | 00:00:00 | 00:00:04 | -01:59:56 |
> > | 00:00:00 | 00:00:05 | -01:59:55 |
> > | 00:00:00 | 00:00:06 | -01:59:54 |
> > | 00:00:00 | 00:00:07 | -01:59:53 |
> > | 00:00:00 | 00:00:08 | -01:59:52 |
> > | 00:00:00 | 00:00:09 | -01:59:51 |
> > | 00:00:00 | 00:00:10 | -01:59:50 |
> > | 00:00:00 | 00:00:11 | -01:59:49 |
> > | 00:00:00 | 00:00:12 | -01:59:48 |
> > | 00:00:00 | 00:00:13 | -01:59:47 |
> > | 00:00:00 | 00:00:14 | -01:59:46 |
> > | 00:00:00 | 00:00:15 | -01:59:45 |
> > 
> > #+TBLFM:
> > @2$3=$1-$2;T::@3$3=$1-$2;T::@4$3=$1-$2;T::@5$3=$1-$2;T::@6$3=$1-$2;T::@7
> > $3=$1-$2;T::@8$3=$1-$2;T::@9$3=$1-$2;T::@10$3=$1-$2;T::@11$3=$1-$2;T::@12
> > $3=$1-$2;T::@13$3=$1-$2;T::@14$3=$1-$2;T::@15$3=$1-$2;T::@16$3=$1-$2;T::@
> > 17$3=$1-$2;T
> > 
> > |   Data 1 |   Data 2 |     Total |
> > |
> > |----------+----------+-----------|
> > |
> > | 00:00:00 | 00:00:16 | -01:59:44 |
> > | 00:00:00 | 00:00:17 | -01:59:43 |
> > | 00:00:00 | 00:00:18 | -01:59:42 |
> > | 00:00:00 | 00:00:19 | -01:59:41 |
> > | 00:00:00 | 00:00:20 | -01:59:40 |
> > | 00:00:00 | 00:00:21 | -01:59:39 |
> > | 00:00:00 | 00:00:22 | -01:59:38 |
> > | 00:00:00 | 00:00:23 | -01:59:37 |
> > | 00:00:00 | 00:00:24 | -01:59:36 |
> > | 00:00:00 | 00:00:25 | -01:59:35 |
> > | 00:00:00 | 00:00:26 | -01:59:34 |
> > | 00:00:00 | 00:00:27 | -01:59:33 |
> > | 00:00:00 | 00:00:28 | -01:59:32 |
> > | 00:00:00 | 00:00:29 | -01:59:31 |
> > | 00:00:00 | 00:00:30 | -01:59:30 |
> > | 00:00:00 | 00:00:31 | -01:59:29 |
> > 
> > #+TBLFM:
> > @2$3=$1-$2;T::@3$3=$1-$2;T::@4$3=$1-$2;T::@5$3=$1-$2;T::@6$3=$1-$2;T::@7
> > $3=$1-$2;T::@8$3=$1-$2;T::@9$3=$1-$2;T::@10$3=$1-$2;T::@11$3=$1-$2;T::@12
> > $3=$1-$2;T::@13$3=$1-$2;T::@14$3=$1-$2;T::@15$3=$1-$2;T::@16$3=$1-$2;T::@
> > 17$3=$1-$2;T
> > 
> > |   Data 1 |   Data 2 |     Total |
> > |
> > |----------+----------+-----------|
> > |
> > | 00:00:00 | 00:00:59 | -01:59:01 |
> > | 00:00:00 | 00:01:00 | -01:59:00 |
> > | 00:00:00 | 00:01:01 | -01:58:59 |
> > | 00:00:00 | 00:01:02 | -01:58:58 |
> > | 00:00:00 | 00:01:03 | -01:58:57 |
> > | 00:00:00 | 00:01:04 | -01:58:56 |
> > | 00:00:00 | 00:01:05 | -01:58:55 |
> > | 00:00:00 | 00:01:06 | -01:58:54 |
> > | 00:00:00 | 00:01:07 | -01:58:53 |
> > | 00:00:00 | 00:01:08 | -01:58:52 |
> > | 00:00:00 | 00:01:09 | -01:58:51 |
> > | 00:00:00 | 00:01:10 | -01:58:50 |
> > | 00:00:00 | 00:01:11 | -01:58:49 |
> > | 00:00:00 | 00:01:12 | -01:58:48 |
> > | 00:00:00 | 00:01:13 | -01:58:47 |
> > | 00:00:00 | 00:01:14 | -01:58:46 |
> > 
> > #+TBLFM:
> > @2$3=$1-$2;T::@3$3=$1-$2;T::@4$3=$1-$2;T::@5$3=$1-$2;T::@6$3=$1-$2;T::@7
> > $3=$1-$2;T::@8$3=$1-$2;T::@9$3=$1-$2;T::@10$3=$1-$2;T::@11$3=$1-$2;T::@12
> > $3=$1-$2;T::@13$3=$1-$2;T::@14$3=$1-$2;T::@15$3=$1-$2;T::@16$3=$1-$2;T::@
> > 17$3=$1-$2;T
> > 
> > Best, Martyn
> > 
> > --
> > 
> > I _will_ engage brain before posting to the ML :(
> 
> I can't see straight at this time of the night, but aren't all these
> formulas equivalent to a column formula?
> 
> #+TBLFM: $3 = $1 - $2;T
> 
> Assuming that's the case, the problem is that org-table-time-to-string
> assumes that it is given a positive number and mishandles negative
> numbers, eg. the first row in the last table invokes:
> 
> ,----
> 
> | (org-table-time-seconds-to-string -59 nil)
> | "-01:59:01"
> 
> `----
> 
> 
> I didn't check carefully, but it looks as if the other-way function,
> org-table-time-string-to-seconds, deals correctly with "negative" time
> strings.
> 
> Nick