Dear R users, My input is a matrix. The matrx rows are sample; the matrix columns are features. I need an output matrix which include the original features and some kinds of transformed features. For example, there are only three features x1, x2, and x3 in my original matrix (input matrix). The features of output matrix consist of base feature "block", interaction terms "block", log-transformed feature "block", etc., i.e., the features of output matrix are:
x1, x2, x3, x1:x2, x1:x3, x2:x3, log(x1), log(x2), log(x3), sqrt(x1), sqrt(x2), sqrt(x3), ... Is there any handy method in R to expand the matrix in this way? Thanks, -Luke ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
