[R] how to setdiff on lists of lists

[PIKAL Petr]

Hi

you have something wrong in your R session, works for me.

> aa<-list(c(1:3), c(4:6))
> aa
[[1]]
[1] 1 2 3

[[2]]
[1] 4 5 6

> bb<-list(3,5)
> bb
[[1]]
[1] 3

[[2]]
[1] 5

> lapply(aa, setdiff, bb)
[[1]]
[1] 1 2

[[2]]
[1] 4 6

Regards
Petr


> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of Simone Gabbriellini
> Sent: Friday, February 01, 2013 11:16 AM
> To: r-help at r-project.org
> Subject: [R] how to setdiff on lists of lists
> 
> Dear List,
> 
> I have a data structure like:
> 
> > aa
> [[1]]
> [1] 1 2 3
> 
> [[2]]
> [1] 4 5 6
> 
> > bb
> [[1]]
> [1] 3
> 
> [[2]]
> [1] 5
> 
> I would like to set differences between "aa" and "bb" and get as result
> another list of lists like:
> 
> > res
> [[1]]
> [1] 1 2
> 
> [[2]]
> [1] 4 6
> 
> I am trying:
> 
> lapply(aa, setdiff, bb)
> 
> but I simply get "aa" back as result. Could you please point me in the
> right direction about the combination of functions that I need to
> accomplish this task?
> 
> Best regards,
> Simone
> 
> --
> Simone Gabbriellini, PhD
> 
> PostDoc at DISI, University of Bologna
> mobile: +39 340 39 75 626
> email: simone.gabbriellini at unibo.it
> home: www.digitaldust.it
> 
> DigitalBrains srl
> Amministratore
> mobile: +39 340 39 75 626
> email: simone.gabbriellini at digitalbrains.it
> home: www.digitalbrains.it
> 
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