From mboxrd@z Thu Jan  1 00:00:00 1970
From: qkbeyond@gmail.com
Subject: org table spreadsheet problem
Date: Mon, 28 Nov 2011 15:32:05 +0800
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hi,all. 
I have a orgtbl like the following,

| # |  2 | a   |
| # | -2 | abc |
| # |  5 | abc |
| # | -3 | a   |
|---+----+-----|
|   |    |     |
| ^ |  x |     |

and i want to sum the second column which the corresponding  third
column's values="abc"  to variable x. (in this example  $x = -2+5 = 3). 
what Formula syntax for Calc/Lisp can achieve this,please. thanks.