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
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