splitstackshape (version 1.0)
Functions to split concatenated data, conveniently stack columns
of data.frames, and conveniently reshape data.frames.
Description
Online data collection tools like Google Forms often export
multiple-response questions with data concatenated in cells. The
concat.split family of functions conveniently splits such data into
separate cells. The package also includes functions to conveniently stack
groups of columns and to reshape wide data, even when the data are
"unbalanced"---something which reshape (from base R) does not handle, and
which melt and dcast from reshape2 do not easily handle.