[R] Putting referenced titles on plots

[Spencer Graves]

      1.  That seems strange.  The following simplification of your 
function produced sensible results for me: 

             hist(1:4, main= "1098_s_at")

      I got similar results from your exact statement after first 
defining names and ctx as follows: 

      names <- letters[1:3]
      ctx <- data.frame(x=1:4, y=1:4, a=1:4)

      In each case, I got a histogram with a standard text title at the 
top.  What version of R are you running?  If it's NOT R 1.9.0pat, you 
might try upgrading -- and then running "update.packages()". 

      2. "names" is that name of a function, and it is generally 
considered bad practice to mask function names with names of other 
objects, even though R can often (though not always) determine which 
object you want from the context.  What do you get from "conflicts()"? 

      hope this helps.  spencer graves

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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