how to index a column matrix based on other column matrix?

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EM geo
EM geo 2019-11-11
评论： Ajay Pattassery 2019-11-14
Hi! I have two column matrix of different lenght (B is little than A). i want to indexing B using values from A and create a new column matrix C with the selected values.
I attached my matrices.
Thanks in advance!
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Stephen23
Stephen23 2019-11-11
Hopefully those are not timesamps stored as integers!
It is not clear what you mean by indexing, given that the values are on the order of 1e7 - 1e8 and yet the arrays have only hundred or so elements. Perhaps you really mean some set operation e.g. setdiff or to find the indices of matching/non-matching values?
Ajay Pattassery
Ajay Pattassery 2019-11-14
I have inspected your vectors. Could you explain how the new column matrix C is created.

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