On 18/03/2014 7:14 AM, Thomas wrote:
Does anyone know why this is happening? Which() is picking up the
indices of the numbers 13 and 15 in neilist, but it's missing out the
13 at index 6.
Thank you,
Thomas Chesney
> neilist
[1] 13 15 28 29 30 13 14 15 28 30 43 44 45 14 15 29 44 45
> pfriends
[1] 13 15
> which(neilist==pfriends)
[1] 1 2 8
Two problems with your code. The first is recycling. Your expression
neilist == pfriends compares neilist[1] with pfriends[1], then
neilist[2] with pfriends[2], then neilist[3] with pfriends[1], etc.
The second problem is that pfriends is not an integer vector, so it may
actually contain 13.00000000001 and 14.9999999999
(or similar numbers that round to 13 and 15 when printed), and those
won't test equal to 13 and 15.
Duncan Murodch
> neilist[6]
[1] 13
> str(neilist)
int [1:18] 13 15 28 29 30 13 14 15 28 30 ...
> str(pfriends)
num [1:2] 13 15
> sessionInfo()
R version 2.15.3 (2013-03-01)
Platform: i386-apple-darwin9.8.0/i386 (32-bit)
locale:
[1] en_GB.UTF-8/en_GB.UTF-8/en_GB.UTF-8/C/en_GB.UTF-8/en_GB.UTF-8
attached base packages:
[1] splines grid stats graphics grDevices utils
datasets methods
[9] base
other attached packages:
[1] spdep_0.5-56 coda_0.16-1 deldir_0.0-21 maptools_0.8-23
foreign_0.8-52
[6] nlme_3.1-108 MASS_7.3-23 Matrix_1.0-11 lattice_0.20-13
boot_1.3-7
[11] sp_1.0-8 igraph_0.6.5-1
loaded via a namespace (and not attached):
[1] LearnBayes_2.12 tools_2.15.3
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