In r, how can I create a list from a matrix with NAs stripped?

Question

I have a character matrix with differing numbers of NA in different rows. I would like to create a structure that has the same number of rows, with all the NAs removed.

Answer 1

Using a simple apply :

x <- matrix(1:10,ncol=2)
x[c(4,7,8)] <- NA

apply(x,1,na.exclude)

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edit : if all rows have exactly the same amount of NA's, then this will return a matrix. For conversion of this matrix to a list, see : How to convert a matrix to a list of column-vectors in R? .