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org.texi: Mention when a table header is mandatory

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* org.texi (Column formulas): Add a sentence to be more explicit about
when a table header is mandatory.
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Michael Brand 2012-08-24 19:46:49 +02:00 committed by Bastien Guerry
parent e39299d822
commit efab563317
1 changed files with 7 additions and 4 deletions
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@ -2770,10 +2770,13 @@ Named field, see @ref{Advanced features}.
When you assign a formula to a simple column reference like @code{$3=}, the
same formula will be used in all fields of that column, with the following
very convenient exceptions: (i) If the table contains horizontal separator
hlines, everything before the first such line is considered part of the table
@emph{header} and will not be modified by column formulas. (ii) Fields that
already get a value from a field/range formula will be left alone by column
formulas. These conditions make column formulas very easy to use.
hlines with rows above and below, everything before the first such hline is
considered part of the table @emph{header} and will not be modified by column
formulas. Therefore a header is mandatory when you use column formulas and
want to add hlines to group rows, like for example to separate a total row at
the bottom from the summand rows above. (ii) Fields that already get a value
from a field/range formula will be left alone by column formulas. These
conditions make column formulas very easy to use.
To assign a formula to a column, type it directly into any field in the
column, preceded by an equal sign, like @samp{=$1+$2}. When you press