There is a 'comment' function. It sets an attribute which gets carried
along with the dataframe when it is saved or copied:
> df1 <-data.frame(NA)
> df1
NA.
1 NA
> comment(df1) <- "empty dataframe"
> comment(df1)
[1] "empty dataframe"
> df2 <- df1
> comment(df2) <- c(comment(df1), "copy of df1")
> comment(df2)
[1] "empty dataframe" "copy of df1"
> comment(df1) <- c("empty dataframe", summary(df1))
> comment(df1)
[1] "empty dataframe" "Mode:logical " "NA's:1 "
On Jun 22, 2011, at 10:57 AM, Robert Lundqvist wrote:
Every now and then I realize that my attempts to document what all
dataframes consist of are unsufficient. So far, I have been writing
notes in an external file. Are there any better ways to do this
within R? One possibility could be to set up the data as packages,
but I would like to have a solution on a lower level, closer to
data. I can't find any pointers in the standard manuals. Suggestions
are most welcome.
Robert
**********************
Robert Lundqvist
Norrbotten regional council
Sweden
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David Winsemius, MD
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