Karl Voit <devn...@karl-voit.at> writes:
>>
>> @# is the row number, so to refer to that row, you need @@#. Something like
>> this,
>> although I didn't test to see if everything gets parsed correctly:
>>
>> #+TBLFM: $2=if(2 == @#, 0, remote(my-table,@@#$1))::$3=if(2 == @#,
>> 0, remote(my-table,@@#-1$1))::$4=if(2 == @#, 0,
>> (remote(my-table,@@#$1)-remote(my-table,@@#-1$1)))
>
> This is a huge step forward:
>
> #+NAME: my-table
> | Numbers |
>
> |---------|
> | 1 |
> | 5 |
> | 8 |
> | 12 |
> | 15 |
>
> | Line | exp. Reference1 | exp. Reference2 | exp. Difference |
> |------+-----------------+-----------------+-----------------|
> | 1 | 0 | 0 | 0 |
> | 2 | 5 | 1 | 4 |
> | 3 | 8 | 5 | 3 |
> | 4 | 12 | 8 | 4 |
> | 5 | 15 | 12 | 3 |
>
>
> | Line | actual Reference1 | actual Reference2 | Difference |
> |------+-------------------+-------------------+------------|
> | 1 | 0 | 0 | 0 |
> | 2 | 5 | 5 | 0 |
> | 3 | 8 | 8 | 0 |
> | 4 | 12 | 12 | 0 |
> | 5 | 15 | 15 | 0 |
>
> #+TBLFM: $2=if(2 == @#, 0, remote(my-table,@@#$1))::$3=if(2 == @#, 0,
> remote(my-table,@@#-1$1))::$4=if(2 == @#, 0,
> (remote(my-table,@@#$1)-remote(my-table,@@#-1$1)))
>
> Somehow, the "-1" in "@@#-1$1" does not have any effect: "@@#$1" and
> "@@#-1$" gives the same results.
>
> Do you have any idea why?
Yes, that's what I was afraid of when I said "...if everything is parsed
correctly".
AFAICT, you cannot use expressions (I tried parentheses and curly braces as
well: the
formula debugger complains that it expected a number.
One workaround is to add a column to the original table where you *can*
calculate
using row/column expressions and then use each column where appropriate in the
remote references. Something like this:
--8<---------------cut here---------------start------------->8---
#+NAME: my-table
| Numbers | shifted |
|---------+---------|
| 1 | 0 |
| 5 | 1 |
| 8 | 5 |
| 12 | 8 |
| 15 | 12 |
#+TBLFM: @2$2..@>$2 = if(2==@#, 0, @-1$1)
| Line | exp. Reference1 | exp. Reference2 | exp. Difference |
|------+-----------------+-----------------+-----------------|
| 1 | 0 | 0 | 0 |
| 2 | 5 | 1 | 4 |
| 3 | 8 | 5 | 3 |
| 4 | 12 | 8 | 4 |
| 5 | 15 | 12 | 3 |
| Line | actual Reference1 | actual Reference2 | Difference |
|------+-------------------+-------------------+------------|
| 1 | 0 | 0 | 0 |
| 2 | 5 | 1 | 4 |
| 3 | 8 | 5 | 3 |
| 4 | 12 | 8 | 4 |
| 5 | 15 | 12 | 3 |
#+TBLFM: $2=if(2 == @#, 0, remote(my-table,@@#$1))::$3=if(2 == @#, 0,
remote(my-table,@@#$2))::$4=$2-$3
--8<---------------cut here---------------end--------------->8---
But somebody (perhaps Michael Brand, if he is around) might come up
with better ideas.
>
>> Turning on formula debugging with `C-c {' helps.
>
> Woha! I didn't know that! And I also didn't know =C-c }= for
> displaying column/row numbers :-O *This* is going to be handy for me
> ;-)
Both Emacs and Org Mode are unending sources of new discovery and
delight!-)
--
Nick
"There are only two hard problems in computer science: cache
invalidation, naming things, and off-by-one errors." -Martin Fowler
