On Feb 8, 2011, at 11:40 AM, Sparks, John James wrote:
Hi,
I have one of those questions that I suspect is very simple, but
hard to
classify, so I have been searching for quite some time and am not
able to
find it.
If I have a data frame and I want to change all the values of one of
the
columns to blanks, what is the syntax? I tried a few different
spellings
of Null,
Null wouldn't work. (It's not a name or value known to the
interpreter.) Setting to NULL would have removed the whole column.
etc., but can't get it. Can someone please send me what I
suspect is a one line solution to this?
A blank is "". Missing is NA
If you want a blank: dfrm$colnm <- ""
If you want missing: is.na(dfrm$colnm) <- TRUE
Many thanks,
--John J. Sparks, Ph.D.
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David Winsemius, MD
West Hartford, CT
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