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From: torys.anderson@gmail.com (Tory S. Anderson)
Subject: Table formulas: daily hour * rate = cost
Date: Thu, 12 Feb 2015 07:17:29 -0500
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I have the followign table, which should speak for itself. First the "cost" column needs to be calculated, which is hours * rate, and then the "hrs" and "ttl" fields should be filled in based on sums of their columns. However, I'm not sure why $cost isn't being evaluated; I've tried it with column names as well as indices but unless I specify each field individually (e.g. @3$5) I can't get a result here. Formula debugging seems to ignore it, too. But I've been trying to follow the example on the "advanced feature" page[1] as closely as possible; what's the problem?

--8<---------------cut here---------------start------------->8---
   |   | Date        | Hours | Rate | Cost |
   | ! |             | hours | rate | cost |
   |---+-------------+-------+------+------|
   |   | February 9  |  4.00 |   38 |    0 |
   |   | February 10 |  4.00 |   38 |    0 |
   |   | February 11 |  4.00 |   38 |    0 |
   |   | February 12 |  4.00 |   38 |    0 |
   |   | February 13 |  4.00 |   38 |    0 |
   |---+-------------+-------+------+------|
   |   |             |   20. |      |    0 |
   | ^ |             |   hrs |      |  ttl |
   #+TBLFM: $5=$hours*$rate::$hrs=vsum(@I..@II)::$ttl=vsum(@I..@II)
--8<---------------cut here---------------end--------------->8---

Footnotes: 
[1]  http://orgmode.org/org.html#Advanced-features