\name{row_order-HeatmapList-method}
 \alias{row_order,HeatmapList-method}
 \title{
 Get row order from a heatmap list
 }
 \description{
 Get row order from a heatmap list
 }
 \usage{
 \S4method{row_order}{HeatmapList}(object)
 }
 \arguments{
 
   \item{object}{a \code{\link{HeatmapList-class}} object}
 
 }
 \value{
 A list contains row orders which correspond to the original matrix
 }

 \author{
 Zuguang Gu <z.gu@dkfz.de>
 }

 \examples{

 mat = matrix(rnorm(100), 10)
 ht_list = Heatmap(mat) + Heatmap(mat)
 row_order(ht_list)
 ht = Heatmap(mat, km = 2) + Heatmap(mat)
 row_order(ht_list)

 }