plot - accessing / plotting rows and columns from tables - R -

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ratings = read.table("ratings.txt",             sep="\t",             col.names=c("user", "mid", "rating"),             fill=false,             strip.white=true)  l = colnames(ratings)[2]

this give me 2nd column - ("mid")

however third row in column "mid"

i try:

k = colnames(ratings)[2][3]

but give me n/a. how access rows , columns. , if can, plot them like:

plot(mid~rating)


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