Extracting specfic columns based on a matrix

2015 7 15
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更新时间：2015 7 15
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Hi,
I have matrix A which is 56x1 and I also have matrix B which is 6001x194.
The 56 numbers in matrix A are also found within column 191 of matrix B (they are 56 of the 6001 numbers found in column 191 of matrix B) . I want to extract columns 191, 192,193 & 194 from matrix B but only for the rows where the numbers from Matrix A are the same as the numbers from column 191 of matrix B.
How would I go about doing this? Thanks!

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