On Aug 7, 2009, at 4:29 PM, DebbieMB wrote:
Hi,
I am also new to R and I have a related question. I am trying to set
negative values in a single column of a dataframe to zero and I
can't seem
to do it.
I have tried:
KN1<-subset(KN,select=c(5))
# Here I am selecting the column of the dataframe KN1 and assigning
it the
name KN2 - this step works
KN2<-ifelse(KN1<=0,0,KN1)
# Here I am trying to set negative numbers to zero and leave all other
numbers the same - this doesn't work
KN1 is probably still a dataframe (albeit with only one column) and
you really meant to be working on that column instead of the whole
dataframey-listy-thing with all of its attached attributes and
classes. You need to refer to the name of the column, let's say its
"col1"
KN2 <- ifelse(KN1$col1<=0,0,KN1$col1)
Any help would be appreciated.
Thanks,
Debbie
tonybreyal wrote:
see ?ifelse
you didn't specify what happens if a value is exactly zero in the
dataset
and so i've just bundled it in with the negative case:
x <- rnorm(20, 0, 1)
y<-ifelse(x<=0, 10, 5)
HTH,
Tony Breyal
cmga20 wrote:
Hi i am very new to R and I have been trying to change each
individual
piece of data in a data set to 10 if it is below 0 and 5 if it is
above
0. I know this sounds very easy but i am struggling!!
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