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modify a data.frame within a function
2 messages · Yuval Sapir, Mark Wardle
You need to read about scope. Try using return() from within your function to return the modified data frame to the caller. Best wishes, Mark
On 15/12/2007, Yuval Sapir <ysapir at bgu.ac.il> wrote:
Hello all,
I'm trying to modify a single column of a data frame to remove randomly half of the values. I want to do it within a function, but can not assign the modified column back into the data frame. It was easy and successful without a function, so I suspect the problem is the call of the single column within the function.
removedata<-function(datafull,var.removed)
{
attach(datafull)
NArandom<-rnorm(n=length(var.removed), mean=0, sd=1)
for (i in 1:length(var.removed))
if(NArandom[i]>0)
var.removed[i]<-"NA"
datamiss<<-datafull
detach(datafull)
}
-- Yuval Sapir, PhDResearcherInstitute of Evolution, Haifa UniversityHaifa, Israel 3190?
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Dr. Mark Wardle Specialist registrar, Neurology Cardiff, UK