Thanks Gabor,
In fact I am currently using the first option in your nicely
summarized reply. But many of the automatic plotting functions use the
column labels for labeling the plots and sometimes it is just a bit
inconvenient. Your second option is what Gavin also suggested and I
guess I will go with that after having a look at the Hmisc package.
Thanks for the help.
On Thu, Feb 7, 2008 at 7:59 PM, Gabor Grothendieck
<[EMAIL PROTECTED]> wrote:
> Here are 3 possibilities where the examples use the builtin data set
> BOD:
>
> #1. Use column headings
>
> > names(BOD) <- paste(names(BOD), c("days", "mg/l"), sep = "_")
> > BOD
> Time_days demand_mg/l
> 1 1 8.3
> 2 2 10.3
> 3 3 19.0
> 4 4 16.0
> 5 5 15.6
> 6 7 19.8
>
> #2. add a "units" attribute to each column
>
> > attr(BOD$Time, "units") <- "days"
> > attr(BOD$demand, "units") <- "mg/l"
> > attr(BOD$Time, "units")
> [1] "days"
>
> #3. See ?units in the Hmisc package which
> basically does #2 for you.
>
> library(Hmisc)
> example(units)
>
>
>
>
> On Feb 7, 2008 5:32 AM, Tribo Laboy <[EMAIL PROTECTED]> wrote:
> > Hello,
> >
> > I was wondering if there was an easy way to put information about the
> > measurement units used for each column of a data frame ...
> >
> > Thanks for any pointers,
>
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