Frequencies for a list of vectors
Using vapply instead of sapply or unlist(lapply) here gives you a little more safety. vapply insists that you supply a FUN.VALUE argument that gives a prototype (type and length) of the expected output of FUN. It will stop if FUN returns something unexpected. Compare the following where I misspelled 'collapse'; only vapply catches the error:
marieData <- list('30008'=c(1,0,1,0), '60008'=c(0,0,1,0), '90008'=c(0,0,1,0), '100007'=1, '130001'=c(0,1))
unlist(lapply(marieData, paste, collaps=''))
300081 300082 300083 300084 600081 600082 600083 600084 900081 900082 "1 " "0 " "1 " "0 " "0 " "0 " "1 " "0 " "0 " "0 " 900083 900084 100007 1300011 1300012 "1 " "0 " "1 " "0 " "1 "
sapply(marieData, paste, collaps='')
$`30008` [1] "1 " "0 " "1 " "0 " $`60008` [1] "0 " "0 " "1 " "0 " $`90008` [1] "0 " "0 " "1 " "0 " $`100007` [1] "1 " $`130001` [1] "0 " "1 "
vapply(marieData, paste, collaps='', FUN.VALUE='')
Error in vapply(marieData, paste, collaps = "", FUN.VALUE = "") : values must be length 1, but FUN(X[[1]]) result is length 4 vapply(X,FUN,FUN.VALUE) also gives you a better result when length(X) is 0, meaning that you don't have to write special code to catch that case. Bill Dunlap TIBCO Software wdunlap tibco.com On Tue, Aug 5, 2014 at 1:53 PM, Peter Alspach
<Peter.Alspach at plantandfood.co.nz> wrote:
Alternatively, use sapply instead of lapply ....
marieData <- list('30008'=c(1,0,1,0), '60008'=c(0,0,1,0), '90008'=c(0,0,1,0), '100007'=1, '130001'=c(0,1))
marieData
$`30008`
[1] 1 0 1 0
$`60008`
[1] 0 0 1 0
$`90008`
[1] 0 0 1 0
$`100007`
[1] 1
$`130001`
[1] 0 1
table(sapply(marieData, paste, collapse=''))
-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of Rui Barradas
Sent: Wednesday, 6 August 2014 8:49 a.m.
To: Marie-Pierre Sylvestre; r-help at r-project.org
Subject: Re: [R] Frequencies for a list of vectors
Hello,
Maybe something like
table(unlist(lapply(HTNlist, paste, collapse = '')))
(Untested, it's a bad idea not to use ?dput to give a data example.) Use
dput(head(HTNlist)) # paste the output of this in a mail
Hope this helps,
Rui Barradas
Em 05-08-2014 18:39, Marie-Pierre Sylvestre escreveu:
Dear R users,
I have a list of vectors (list is called HTNlist). Each vector is of
length
1 to 4 and takes only 0 and 1 as values. E.g.
head(HTNlist)
$`30008`
[1] 1 0 1 0
$`60008`
[1] 0 0 1 0
$`90008`
[1] 0 0 1 0
$`100007`
[1] 1
$`130001`
[1] 0 1
$`130007`
[1] 1 0 1 0
I would like to obtain a frequency table for the elements of the list.
I want to know how many of
'1 0 0' I have in the list, how many '1 0 1 0' etc.
Can you please help?
Thank you in advance,
MP
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