[R] Count number of rows in a matrix with a character pattern

[katarv]

Hi,

I have a large data set that I input as a matrix, where I have  1:x rows
with names AX, then  x+1: y rows named AY, etc.  The idea is that I have to
count how many rows exactly I have with name AX and how many I have with
name AY (or find which row numbers have names AX). Is there any way in R to
count a number of rows with a name matching a required pattern?


Thanks in advance,

Katie 

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