Chapter 3 Ordering rows and columns
By default, the rows and columns are ordered as in the original input.
3.1 Using hierarchical clustering to order the rows/columns
You can set the ordering of the rows/columns based on a “pretty” hierarchical clustering by specifying
pretty.order.rows = TRUE and
pretty.order.cols = TRUE. Errors may arise when the matrix has missing values.
3.2 Specifying the ordering of the columns or rows
If, instead, you would like to specify a custom ordering of the rows and columns, you can simply provide the order vector to the
order.cols arguments. In the example below, we order the rows by the
mpg variable from the original matrix. Note that we could order by any vector i.e. we are not restricted to ordering by a column or row in our matrix.