extracting data from matrix

[jabcok23]

Hello everyone!

I have the following problem:
I receive from the simulation matrix like this:

1  0,65
2  0,49
3  0,35
4  0,74
5  0,62
6  0,85
7  0,27

I would like to know how to extract the data from the second column
corresponding to the following values  from the first column [1, 2, 4, 7] in
the form of a vector.

Thank you for your help!





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