[R] Which() missing a number

[Sicotte, Hugues, Ph.D.]

I think you want to do

which(neilist %in% pfriends)


-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of Thomas
Sent: Tuesday, March 18, 2014 6:14 AM
To: r-help at r-project.org
Subject: [R] Which() missing a number

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

 > 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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