[R] getting numeric arrays from data frame
mark.farnell at gmail.com
Mon Apr 7 05:15:14 CEST 2008
Currently I invoke:
foo <- read.table("foo.data", header=TRUE)
to read a table into foo
Then when I try to plot a histogram out of the 5th column of foo:
It fails and it says:
Error in hist.default(foo) : 'x' must be numeric
Then I tried:
So how can I get an numeric array out of one of the columns?
Also suppose if the dataframe foo (above) has eight columns and I want
to make an x-y scatter plot on two of the columns, how can I extract
these two specific columns?
More information about the R-help