... and it is also missing the 15 at position 15.

Can't explain but 

    > which( neilist %in% pfriends )

should give you what you want.



On Tuesday 18 March 2014 11:14:08 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
> 
>  > 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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