From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christian Moe <mail@christianmoe.com>
Subject: Re: questions about table mode and spreadsheets
Date: Tue, 07 Sep 2010 00:44:03 +0200
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To: Inquisitive Scientist <inquisitive.scientist@gmail.com>
Cc: emacs-orgmode@gnu.org

On 9/6/10 3:38 PM, Inquisitive Scientist wrote:

>    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 |
> |------+---+---+---|

Here's one way: Add a new row after the first, as below. Then run C-c
C-c on the formula line:

| name |   | a | b | c |
|------+---+---+---+---|
| foo  |   | 1 | 2 | 3 |
| bar  |   | 3 | 2 | 1 |
| bar  |   | 4 | 5 | 6 |
|------+---+---+---+---|
|      |   |   |   |   |
   #+TBLFM: $2='(if (string= $1 "bar") 1 0):: 
@5$3=vsum(vmask(@I$2..@II$2,@I..@II))

It does exactly what you asked, but I don't think it will scale well...

Cheers,
Christian

>
> Thanks,
> -I.S.
>
>
>
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-- 

Christian Moe
E-mail:  mail@christianmoe.com
Website: http://christianmoe.com