[R] Extracting part of an array

Poizot Emmanuel poizot at cnam.fr
Tue Jun 18 16:10:12 CEST 2002

I've got a trivial question ,but as a newby, I'm stuk.
I've got an array of dim 160,4. I want to extract the values of the first 
column based on a condition of values in the second column and affect the 
result to a variable.

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