Draw dendrogram on row or column
Draw dendrogram on row or column
    which = c("row", "column"), k = 1, max_height = NULL, ...)

  \item{object}{a \code{\link{Heatmap-class}} object.}
  \item{which}{is dendrogram put on the row or on the column of the heatmap?}
  \item{k}{a matrix may be splitted by rows, the value identifies which row-slice.}
  \item{max_height}{maximum height of the dendrograms.}
  \item{...}{pass to \code{\link[grid]{viewport}}, basically for defining the position of the viewport.}

If the matrix is split into several row slices, a list of dendrograms will be drawn by 
the heatmap that each dendrogram corresponds to its row slices.

A viewport is created which contains dendrograms.

This function is only for internal use.
This function returns no value.
Zuguang Gu <z.gu@dkfz.de>
# There is no example