Hi I am trying to modify a data frame D with lists x and y in such a way that if a value in x==0 then it should replace that value with the last not zero value in x. I.e. for loop over i{ if(D$x[i]==0) D$x[i]=D$x[i-1] }
The data frame is quite large in size ~ 43000 rows. This operation is taking a large amount of time. Can someone please suggest me what might be the reason. Thanks Regards Siddharth Sent on my BlackBerry® from Vodafone ______________________________________________ R-help@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.