[R] How to find the min and max of two variables in a data frame

[Bill.Venables at csiro.au]

edge_dir <- within(edge_dir, {
     vmin <- pmin(cid_dir1, cid_dir2)
     vmax <- pmax(cid_dir1, cid_dir2)
})


________________________________________
From: r-help-bounces at r-project.org [r-help-bounces at r-project.org] On Behalf Of kxk [kkong at u.washington.edu]
Sent: 24 July 2009 15:31
To: r-help at r-project.org
Subject: [R]  How to find the min and max of two variables in a data frame

I have two variables in a data frame, I want to generate two additional
variables. For every observations (i.e. every row), I want the first new
variable 'min' to carry the minimum of the two existing variables, and I
want the second new variable 'max' to carry the maximum of the two existing
variables.  I then want to sort the data frame by min and max, and delete
duplicated rows if both rows has the same min and same max.

I am new to R so not sure how to fix my code.  Here is my attempt and it is
not working.  Thanks!

edge_dir$min=edge_dir[if (edge_dir$cid_dir1 < edeg_dir$cid_dir2)
edge_dir$cid_dir1 else edge_dir$cid_dir2]
edge_dir$max=edge_dir[if (edge_dir$cid_dir1 > edeg_dir$cid_dir2)
edge_dir$cid_dir1 else edge_dir$cid_dir2]

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