[ferret_users] [ferret] compress, expand variable

[Patrick Brockmann <Patrick.Brockmann@xxxxxx>]

Hi all,

Is there a way to compress a variable from
a selection of index ?

Here is an example of what I am looking for:
let A={101,202,303,404,505,606,707,808,909}
let B={3,6,7,9}

Now, I would like to get a new variable C to work on A from the selected 
indexes B.
This new variable C will be equal to :
303,606,707,909

Thanks for any idea on this topic
Patrick