[R] coercing created variables into a new data frame using na.omit()

From: sp219 <S.Pickett_at_exeter.ac.uk>
Date: Fri 12 Aug 2005 - 22:42:43 EST


Hi,
I am an R newbie and one thing I am having trouble with binding variables that I have created within one data frame into a new data frame when using na.omit(). To illustrate this problem I will give the example I am working on and the approah I have been using:-
data.frame1<-filepath....
attach(data.frame1)
#create a new variable using a function
new.variable<-rep(1,length(weight3))
for (x in 1:length(new.variable))
{f<-((((age1[x]-7)*(weight[x]-mw))+((age2[x]-7)*(weight2[x]-mw))+((age3[x]-7)* (weight3[x]-mw)))/(((age1[x]-7)^2)+((age2[x]-7)^2)+((age3[x]-7)^2))); new.variable[x]<-f}
#then bind it into the existing old data frame
data.frame2<-cbind(data.frame1,newvariable) rm(dat.frame1)
attach(data.frame2)
#everything o.k. so far but now the problem part... I basically want to remove
all the rows with NA in the new data frame including corresponding rows in the new variable
data.frame3<-na.omit(data.frame2)
rm(data.frame2)
attach(data.frame3)
length of new.variable has not changed but the length of all the other variables in data.frame2 has?
Could someone please provide an explanation or an alternative route if possible?
Any suggestions much appreciated,
Thankyou, Simon Pickett

Simon Pickett
Centre for Ecology and Conservation Biology University of Exeter in Cornwall
Tremough Campus
Penryn
Cornwall
TR10 9EZ UK
Tel: 01326371852



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