On May 28, 2011, at 7:19 AM, Marius Hofert wrote:
Dear all,
another ftable problem, now related to formatC.
One typically would like to format entries in an ftable (adjust
digits, replace NA, ...)
before format() is applied to convert the formatted ftable to an
object which
xtable can deal with. The output of xtable can then be used within a
LaTeX table.
> 1/3
[1] 0.3333333
> options(digits=3)
> 1/3
[1] 0.333
The problem I face is that the ftable entries [numeric] change their
mode when
one of the operations "adjust digits" or "replace NA" is applied.
Here is a
minimal example:
## first adjusting the format, then trying to remove NA
(ft <- ftable(Titanic)) # ftable
ft[1,1] <- NA # create an NA entry to show the behavior
is.numeric(ft) # => is numeric
ft. <- formatC(ft, digits=1, format="f") # adjust format
is.numeric(ft.) # => not numeric anymore => one can not further use
is.na() etc.
ft.[is.na(ft.)] <- "my.Command.To.Deal.With.NA" # does not work
because is.na() does not find NA
ft. # (of course) still contains NA
## first remove NA, then trying to adjust the format
(ft <- ftable(Titanic)) # ftable
ft[1,1] <- NA
ft[is.na(ft)] <- "my.LaTeX.Code.To.Deal.With.NA"
is.character(ft) # => now character, adjusting the format of the
numbers with formatC not possible anymore
ft
formatC(ft, digits=1, format="f") # (of course) not working anymore
How can I accomplish both (example-)tasks without changing the mode
of the ftable entries?
Note: I would like to keep the ftable structure since this nicely
converts to a
LaTeX table later on.
Cheers,
Marius
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David Winsemius, MD
West Hartford, CT
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
