Compress a matrix or a data frame with duplicated rows, updating row weights to reflect frequencies, or reverse the process, reconstructing a matrix like the one compressed (subject to permutation of rows and weights not adding up to an integer).
compress_rows(x, ...)decompress_rows(x, ...)
For compress_rows A weighted matrix or data frame of the same
type with duplicated rows removed and weights updated appropriately.
a weighted matrix or data frame.
extra arguments for methods.