Hi all, In addition, I am planning to do a multiple imputation with MICE package using the data read by bigmemory package. So usually, the multiple imputation code is like this: > imp=mice(data.frame,m=50,seed=1234,print=F) the data.frame is required. How can I change the big.matrix class generated by bigmemory package to a data.frame? Thank you very much. ya