Dear all, maybe a simple problem but I found no solution for my problem. I have a matrix Y with 23 000 rows and 220 colums. The entries are "A", "B" or "C". I want to extract all rows (as a matrix ) of the matrix Y where all entries of a row are (for example) "A". Is there any solution? I tried the stringr- package but i doesn't work out. All the best and thanks! Peter
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