Hi, I think some time ago min() and max() were extended from series (and lists) to matrices. First, this is missing in the function reference, I could add that. Secondly, however, they fail whenever the matrix collapses to 1x1, for example: eval min(I(3)[1,1]) It would be good if it also worked on scalars to allow general code that may yield 1x1-matrices. thanks sven