Hi
r-help-boun...@r-project.org napsal dne 19.04.2011 12:02:31:
> On 04/19/2011 07:39 PM, Simone Gabbriellini wrote:
> > Hello List,
> >
> > I have a data frame like:
> >
> > V130 V131 V132 V133 V134 V135 V136
> > 1 0 0 0.9 0 0.9 0 0
> > 2 0 0 0 0 0 0.8
> > 3 0 0 0 0 0.9 0 0
> > 4 0.9 0 0 0 0 0 0.9
> > 5 0 0 0
> > 6 0 0 0 0.9 0 0 0.9
> > 7 0 0 0.8 0 0 0 0
> > 8 0.9 0 0 0.9 0.8 0
> > 9 0 0 0 0.9 0.9 0 0
> > 10 0 0 0 0 0 0 0.9
> >
> > I would like to fill the empty cells with a 0... how to address those
empty cells?
> >
> Hi Simone,
> I'm somewhat surprised that the empty cells aren't displayed as "NA". If
> they are in fact NAs, you could use:
>
> mydataframe[is.na(mydataframe)]<-0
Many functions in R has straightforward way how to handle missing values.
Therefore be careful with changing them to any value until you really need
it for some reason.
x<-rnorm(10)
x[5]<-NA
sum(x)
[1] NA
sum(x, na.rm=TRUE)
[1] 3.264033
mean(x, na.rm=TRUE)
[1] 0.3626703
^^^
x[is.na(x)]<-0
mean(x)
[1] 0.3264033
^^^^
Regards
Petr
Regards
Petr
>
> Jim
>
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