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:
hist(foo[5])
It fails and it says:
Error in hist.default(foo[5]) : 'x' must be numeric
Then I tried:
>typeof(foo[5])
[1] "List"
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?
Thanks
Mark
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