problem with creating loop

[marcin.wozniczka Gazeta.pl]

Hello,
I have small problem with my program/function in Scilab. I want to loop
function - the loop must be repeated until all datas will be use. For
example I have matrix 'a'
a = [1 10 20
       2 20 30
       3 30 40
       1 20 10
       3 40 40
       2 20 10]
and I'm taking all lines which have in the first column the same number,
take average of this and put to the other matrix. I created function which
can do all this thing but I don't have any idea how to make a reapeted loop
from this.

Can you help me?

-- 
Marcin Woźniczka
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