Mikyoung - All answers are "yes", but IMHO you are trying to be too clever with your data structure. Programming is *much* easier if you keep things simple.
Specifically: (1) The function matrix() will happily build you a matrix of type "list", with each element of the list occupying one cell in the matrix. For example, tma <- matrix(as.list(letters), nrow=13, ncol=2) is.list(tma) [1] TRUE is.matrix(tma) [1] TRUE tma[5,2] [[1]] [1] "r" Same effect with tma <- as.list(letters) dim(tma) <- c(13,2) (2) Complex numbers - see help("complex"). This help page even gives an example which constructs a matrix of complex numbers. (3) To find the rank of matrix x, qr(x)$rank. I don't think there is a specific extractor function for this component, but I could be wrong. (4) But, once again, I think you would be better served by storing your two values of different types either as two separate matrices, or as two columns in a data frame, with additional columns of repetitive integers to indicate the row and column in your conceptual matrix. See help("tapply"), help("aggregate") for two functions which can operate on such a data structure, and help("gl") help("col"), help("row") for functions that will generate the additional columns. HTH - tom blackwell - u michigan medical school - ann arbor - On Wed, 12 Nov 2003, Mikyoung Jun wrote: > Hello, > > I have a few questions about matrix in R. > > Can we make a matrix whose elements are list? I would like to save two > different values in each elements of matrix. If there is a package or > something which can deal with complex numbers, that will do it too. Also, > I am wondering whether there is a function to calculate the rank of the > matrix. I found a matrix package, but it doesn't have functions like that. > > Thanks a lot in advance! > > Mikyoung Jun > > ______________________________________________ > [EMAIL PROTECTED] mailing list > https://www.stat.math.ethz.ch/mailman/listinfo/r-help > ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help