search for: some_code_that_generates_data

...it? For example I have a huge matrix called dist and I want two objects obj1 and obj2 to have a memeber dist that points to the matrix, but I don't want, for memory reasons, to copy the matrix twice. As far as I understand the following code will generate three copies of my data: dist <- some_code_that_generates_data obj1$dist <- dist obj2$dist <- dist Thank you! Giampiero