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Count the frequency of a row vector in a data frame
rowMatch(df, vec = NULL)
count the number of vector vec in the data frame
row.no row numbers of the vector vec in the data frame
a data frame or matrix
the vector for matching
df <- data.frame(V1=c(1L,2L),V2=LETTERS[1:3],V3=rep(1,12)) rowMatch(df,c(2,"B",1))
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