questions about table mode and spreadsheets

From: Inquisitive Scientist <inquisitive.scientist@gmail.com>
To: emacs-orgmode@gnu.org
Subject: questions about table mode and spreadsheets
Date: Mon, 6 Sep 2010 09:38:49 -0400	[thread overview]
Message-ID: <AANLkTi=tOw-ThbhBpFTFA3D6FpARrXRXcs4Cuj6VywMa@mail.gmail.com> (raw)

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Dear Experts,

I am becoming very fond of the table/spreadsheet in org-mode and trying to
use it more extensively. I have tried digging through the docs but am still
having trouble with some things:

  1. Is there a way to dynamically add a new row to a table using a table
formula? For example, a variety of org-mode things will produce a table as
output and allow me to specify some formulas. I'd like to add a formula that
says something like "create a row at the bottom that sums column 3" and have
that be a new row that gets added. Any thoughts?

  2. How do I compute the sum of a column only if a corresponding row
matches some condition? For example, how do I compute the sum of numbers in
column a for which the name in column "name" is "bar"? For example, I should
get 7 for the sum in column a in the table below:

| name | a | b | c |
|------+---+---+---|
| foo  | 1 | 2 | 3 |
| bar  | 3 | 2 | 1 |
| bar  | 4 | 5 | 6 |
|------+---+---+---|

Thanks,
-I.S.

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