Replace NAs with mean of the same column of a data.table

Question

I want to replace NAs present in a column of a DATA TABLE with the mean of the same column. I am doing the following. But it is not working.

ww <- data.ta         


        

Answer 1

It is not taking the mean of the entire Sepal.Length column; only the 1 column that you have chosen.

Rather use:

ww[is.na(Sepal.Length) , Sepal.Length:= mean(ww$Sepal.Length, na.rm=TRUE)]