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I'm trying to store an entire matrix/array into a single cell of a data frame, but can't quite remember how to do it. Now before you say it can't be done, I'm sure I remember someone asking a question on SO where it was done, although that wasn't the point of the question so I can't find it again. For example, you can store matrices inti a single cell of a matrix like so: myMat <- array(list(), dim=c(2, 2)) myMat[[1, 1]] <- 1:5 myMat[[1, 2]] <- 6:10 # [,1] [,2] #[1,] Integer,5 Integer,5 #[2,] NULL NULL The trick was in using the double brackets [[]] . Now I just can't work out how to do it for a data frame (or if you can): # attempt to make a dataframe like above (except if I use list() it gets # interpreted to mean the `m` column doesn't exist) myDF <- data.frame(i=1:5, m=NA) myDF[[1, 'm']] <- 1:5 # Error in `[[<-.data.frame`(`*tmp*`, 1, "m", value = 1:5) : # more elements supplied than there are to replace # this seems to work but I have to do myDF$m[[1]][[1]] to get the 1:5, # whereas I just want to do myDF$m[[1]]. myDF[[1, 'm']] <- list(1:5) I think I'm almost there. With that last attempt I can do myDF[[1, 'm']] to retrieve list(1:5) and hence myDF[[1, 'm']][[1]] to get 1:5 , but I'd prefer to just do myDF[[1, 'm']] and get 1:5 .

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