Hi Christian,
On Aug 12, 2007, at 22:33, Christian Schlauer wrote:
| data 1 | data 2 | data 3 | result 1 | result 2 |
|--------+--------+--------+----------+----------|
| 23 | 25 | 17 | 8 | 15 |
| | 24 | 18 | 6 | -6 |
#+TBLFM: $4=$2-$3::$5=$1-$4
Now, a negative value doesn't make sense in my real table. So instead
of printing a nonsensical value, I'd prefer something else there. I
remembered that MATLAB has `NaN', and Calc has that, too: `nan', see
(info "(calc)Infinities"). So I put `nan' in line 3, column 1, and
recalculate the above table:
| data 1 | data 2 | data 3 | result 1 | result 2 |
|--------+--------+--------+----------+----------|
| 23 | 25 | 17 | 8 | 15 |
| nan | 24 | 18 | 6 | nan |
#+TBLFM: $4=$2-$3::$5=$1-$4
It's almost perfect! It is clear that a result for column 5 in line 3
does not exist as there are no data in column 1 of that line. The only
thing that is not perfect is that the alignment in columns 1 and 5 is
messed up due to `nan'.
Could this be fixed?
I like that little trick with nan, it is a nice demonstration the
the full symbolic capabilities of Calc are still present in
Org-mode tables.
The table editor automatically chooses the alignment of a column,
based on the content of the column. There are two customization
variables involved in tuning this behavior:
,----[ C-h v org-table-number-regexp RET ]
| org-table-number-regexp is a variable defined in `org.el'.
| Its value is
|
"^\\([<>]?[-+^.0-9]*[0-9][-+^.0-9eEdDx()%:]*\\|\\(0[xX]\\)[0-9a-fA-
F]+\\)$"
|
|
| Documentation:
| Regular expression for recognizing numbers in table columns.
| If a table column contains mostly numbers, it will be aligned to the
| right. If not, it will be aligned to the left.
|
| The default value of this option is a regular expression which allows
| anything which looks remotely like a number as used in scientific
| context. For example, all of the following will be considered a
| number:
| 12 12.2 2.4e-08 2x10^12 4.034+-0.02 2.7(10) >3.5
|
| Other options offered by the customize interface are more restrictive.
`---
,----[ C-h v org-table-number-fraction RET ]
| org-table-number-fraction is a variable defined in `org.el'.
| Its value is 0.5
|
|
| Documentation:
| Fraction of numbers in a column required to make the column align
right.
| In a column all non-white fields are considered. If at least this
| fraction of fields is matched by `org-table-number-fraction',
| alignment to the right border applies.
`---
So you can either lower the threshold value in
`org-table-number-fraction',
or you can modify the regular expression so that it will interpret nan
as a
number.
I will make the default regexp swallow nan.
- Carsten
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