[R] Build a matrix from another matrix by specifying the indexes

[anna]

Hello R specialists,
I have a base vector called vBase with 102 elements. I have another vector
vec1 which elements are only part of vBase but is shorter. I transform vec1
so I get a vector with the same size as vBase and with each common element
on the same indexed row. If a value is missing in vec1 then I put a Na like
this:

      vec1                vBase
Amsterdam              Amsterdam
Na                         Bruxelles
Dublin                     Dublin 
Frankfurt                 Frankfurt
Paris                       Paris
This is how I did it: vec1 <- vec1[match(vBase,vec1)]
But what I really want to is the same but on a matrix columns, for example
mat <- cbind( vec1, vec2 ,vec3)
I found a way to make a match on each column:
indexes <- apply(mat, 2, match, x = vBase)
It returns me the indexes matrix but I don't know how each index column to
each mat column like I did for vec1 with vec1[]. Any idea?

-----
Anna Lippel
-- 
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