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org.texi: Add a subsection about computing durations.

This commit is contained in:
Bastien Guerry 2011-07-02 13:36:13 +02:00
parent 2e20cf9358
commit ac52b4af77
1 changed files with 26 additions and 2 deletions
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@ -378,6 +378,7 @@ The spreadsheet
* References:: How to refer to another field or range
* Formula syntax for Calc:: Using Calc to compute stuff
* Formula syntax for Lisp:: Writing formulas in Emacs Lisp
* Durations and time values:: How to compute durations and time values
* Field and range formulas:: Formula for specific (ranges of) fields
* Column formulas:: Formulas valid for an entire column
* Editing and debugging formulas:: Fixing formulas
@ -681,6 +682,7 @@ Specific header arguments
expansion during tangling
* session:: Preserve the state of code evaluation
* noweb:: Toggle expansion of noweb references
* noweb-ref:: Specify block's noweb reference resolution target
* cache:: Avoid re-evaluating unchanged code blocks
* sep:: Delimiter for writing tabular results outside Org
* hlines:: Handle horizontal lines in tables
@ -701,6 +703,7 @@ Miscellaneous
* Clean view:: Getting rid of leading stars in the outline
* TTY keys:: Using Org on a tty
* Interaction:: Other Emacs packages
* org-crypt.el:: Encrypting Org files
Interaction with other packages
@ -2243,6 +2246,7 @@ formula, moving these references by arrow keys
* References:: How to refer to another field or range
* Formula syntax for Calc:: Using Calc to compute stuff
* Formula syntax for Lisp:: Writing formulas in Emacs Lisp
* Durations and time values:: How to compute durations and time values
* Field and range formulas:: Formula for specific (ranges of) fields
* Column formulas:: Formulas valid for an entire column
* Editing and debugging formulas:: Fixing formulas
@ -2504,7 +2508,7 @@ Calc also contains a complete set of logical operations. For example
if($1<20,teen,string("")) @r{"teen" if age $1 less than 20, else empty}
@end example
@node Formula syntax for Lisp, Field and range formulas, Formula syntax for Calc, The spreadsheet
@node Formula syntax for Lisp, Durations and time values, Formula syntax for Calc, The spreadsheet
@subsection Emacs Lisp forms as formulas
@cindex Lisp forms, as table formulas
@ -2535,7 +2539,26 @@ embed them in list or vector syntax. Here are a few examples---note how the
'(apply '+ '($1..$4));N
@end example
@node Field and range formulas, Column formulas, Formula syntax for Lisp, The spreadsheet
@node Durations and time values, Field and range formulas, Formula syntax for Lisp, The spreadsheet
@subsection Durations and time values
@cindex Duration, computing
@cindex Time, computing
If you want to compute time values use the @code{T} flag, either in Calc
formulas or Elisp formulas:
@example
@group
| Task 1 | Task 2 | Total |
|--------+--------+---------|
| 35:00 | 35:00 | 1:10:00 |
#+TBLFM: @@2$3=$1+$2;T
@end group
@end example
Values must be of the form @code{[HH:]MM:SS}, where hours are optional.
@node Field and range formulas, Column formulas, Durations and time values, The spreadsheet
@subsection Field and range formulas
@cindex field formula
@cindex range formula
@ -2775,6 +2798,7 @@ dependencies.
If you want the recalculation of fields to happen automatically, or if
you want to be able to assign @i{names} to fields and columns, you need
to reserve the first column of the table for special marking characters.
@table @kbd
@orgcmd{C-#,org-table-rotate-recalc-marks}
Rotate the calculation mark in first column through the states @samp{ },