A) I predict that if you apply the str function to the second test
that you will find that "con" is not numeric but rather of class
character or factor. And the second test is probably not a matrix but
rather a dataframe. Matrices in R need to have all their elements of
the same class.
B) Read the FAQ ... find the one that tells you how to convert factors
to numeric.
--
David Winsemius
On Mar 10, 2009, at 3:29 PM, aaron wells wrote:
Hello, I would like to order a matrix by a specific column. For
instance:
test
[,1] [,2] [,3]
[1,] 1 100 21
[2,] 2 3 22
[3,] 3 100 23
[4,] 4 60 24
[5,] 5 55 25
[6,] 6 45 26
[7,] 7 75 27
[8,] 8 12 28
[9,] 9 10 29
[10,] 10 22 30
test[order(test[,2]),]
[,1] [,2] [,3]
[1,] 2 3 22
[2,] 9 10 29
[3,] 8 12 28
[4,] 10 22 30
[5,] 6 45 26
[6,] 5 55 25
[7,] 4 60 24
[8,] 7 75 27
[9,] 1 100 21
[10,] 3 100 23
This works well and good in the above example matrix. However in
the matrix that I actually want to sort (derived from a function
that I wrote) I get something like this:
test[order(as.numeric(test[,2])),] ### First column is row.names
f con f.1 cov f.2 minimum f.3 maximum f.4 cl
asahi * 100 * 1 * 0.1 * 2 * test
castet * 100 * 2 * 0.1 * 5 * test
clado * 100 * 1 * 0.7 * 2 * test
aulac * 33 * 0 * 0.1 * 0.1 * test
buell * 33 * 0 * 0.1 * 0.1 * test
camlas * 33 * 0 * 0.1 * 0.1 * test
carbig * 33 * 1 * 1 * 1 * test
poaarc * 67 * 0 * 0.1 * 0.1 * test
polviv * 67 * 0 * 0.1 * 0.1 * test
where R interprets 100 to be the lowest value and orders increasing
from there.
is.numeric(test[,2])
[1] FALSE
is.double(test[,2])
[1] FALSE
is.integer(test[,2])
[1] FALSE
is.real(test[,2])
[1] FALSE
My questions are: Why is this happening? and How do I fix it?
Thanks in advance!
Aaron Wells
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
______________________________________________
R-help@r-project.org mailing list
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
