Perhaps BA[, 2] is a factor? What you might need is something like
BA[order(BA[, 1], -as.numeric(BA[, 2]), ]
?
Bill Venables.
________________________________________
From: r-help-boun...@r-project.org [r-help-boun...@r-project.org] On Behalf Of
Jun Shen [jun.shen...@gmail.com]
Sent: 28 March 2009 08:26
To: r-h...@stat.math.ethz.ch
Subject: [R] Sorting problem
Hi, everyone,
I was trying to sort a data frame by two columns, one increasing, the other
decreasing and got an error.
"Error in FUN(left) : invalid argument to unary operator",
The command is "BA[order(BA[1],-BA[2]),]". BA is the data frame. It was
working if I used increasing on both columns.
Why the decreasing symbol "-" is not working here? Thanks.
--
Jun Shen PhD
PK/PD Scientist
BioPharma Services
Millipore Corporation
15 Research Park Dr.
St Charles, MO 63304
Direct: 636-720-1589
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