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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