R help - Sep 2010 - NA problem

Dear R list
I have a problem with NA, which should be a string, but R seems that it 
doesn't recognize it.  What I do is first give the format command to my data
frame:

format.data.frame(mydata,big.mark=" ")

so I give a blank as thousand separator. All my records in my data frame 
become strings, so instead of having NA I have "NA". I try to convert
"NA" in
".",but it seems that R doesn't recognize "NA".

Someone knows why and how to treats those "NA"??


Thanks for your attention

Short answer: don't do that.

The format function is for preparing data for output. Do your data manipulations
on a data frame you keep for such use, and only use format to prepare for
output.

"n.vialma at libero.it" <n.vialma at libero.it> wrote:
>Dear R list
>I have a problem with NA, which should be a string, but R seems that it 
>doesn't recognize it.  What I do is first give the format command to my
data
>frame:
>
>format.data.frame(mydata,big.mark=" ")
>
>so I give a blank as thousand separator. All my records in my data frame 
>become strings, so instead of having NA I have "NA". I try to
convert "NA" in
>".",but it seems that R doesn't recognize "NA".
>
>Someone knows why and how to treats those "NA"??
>
>
>Thanks for your attention
>
>______________________________________________
>R-help at r-project.org mailing list
>https://stat.ethz.ch/mailman/listinfo/r-help
>PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>and provide commented, minimal, self-contained, reproducible code.
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