Hello,

 

In a dataframe, I want the index if the last non-NA data.   Example:

 

d<-data.frame(matrix(c(1,3,4,2,7,8,1,NA,2),3,3,byrow=TRUE))

 

gives:

> d

  X1 X2 X3

1  1  3  4

2  2  7  8

3  1 NA  2

 

I want a vector that gives me  3 2 3

 

I know about tail and which, but I don't know how not to consider the NA

 

e.g.: last<-tail(d,1,na.rm=TRUE) still gives me a NA

> last

  X1 X2 X3

3  1 NA  2


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