[R] Subsetting matrix with values from vector

[jorgusch]

Hello,

I have a large matrix (data), in which there is a column offerid. The values
are numbers (lets say 1:5)
There is another vector (idnew), which contains some of the offerids and
many more (3:10).

I want a subset of the matrix wiith only those rows, which match the
criteria of the vector.

How can I make it work?

Thanks!
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