[R] Putting referenced titles on plots

[Roger D. Peng]

Is `names' by any chance a factor?  What is class(names)?  If 
`names' is a factor, then you're getting the underlying numeric 
representation rather than the factor levels.

-roger

grr at grell.mailshell.com wrote:

> I have a data frame "ctx" and an array "names", where names[i] is the 
> column name for ctx[i], and am making histograms for each column of ctx:
> 
> for (i in 2:ncol(ctx)){hist(ctx[,i], br=100, main=names[i])}
> 
> The titles don't come out like I expect. Each names[i] is something like 
> "1098_s_at" and R doesn't seem to like printing these. Instead, it 
> prints "1" or "2" or "3" etc.
> 
> I have also tried binding ctx and names into a single data frame and 
> referencing the first row of each [i] as the title, but I get the same 
> result.
> 
> Can someone tell me how to get these titles attached?
> 
> Thanks,
> 
> Graham
> 
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