OptionalbyrowFill by rows instead of by columns (R's default). Default false.
OptionalncolNumber of columns (R's ncol). Default: the length of the data divided by nrow (rounded up), or 1 when nrow
is not given either.
OptionalnrowNumber of rows (R's nrow). Default: the length of the data divided by ncol (rounded up), or the length of
the data when ncol is not given either.
Options for matrix.