try
hist(foo[,5])
plot(foo[,c(1,5)])
HTH
> 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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