R help - Feb 2011 - Set a Numeric Field To Blank

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, etc., but can't get it.  Can someone please send me what I
suspect is a one line solution to this?

Many thanks,
--John J. Sparks, Ph.D.

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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