How to edit multi-person objects in R -

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i find following behaviour of r person object rather unexpected:

let's create multi-person object:

a = c(person("huck", "finn"), person("tom", "sawyer"))

imagine want update given name of 1 person in object:

a[[1]]$given <- 'huckleberry'

then if inspect our object, surprise have:

> [1] "  <> [] ()" "tom sawyer"

where'd huckleberry finn go?! (note if try single person object, works fine.) why happen?

how can above more logical behavior of correcting first name?

the syntax want here 

a <-  c(person("huck", "finn"), person("tom", "sawyer")) a[1]$given<-"huckleberry"  #[1] "huckleberry finn" "tom sawyer"

a group of people still "person" , has it's own special indexing function [.person , concat function c.person has perhaps different behavior expecting. problem [[ ]] messing underlying hidden list.

actually, it's interesting because they've overloaded indexing methods person not [<- or [[<- , that's what's causing error. because here, we're same

`$<-`(`[`(a,1), "given", "huckleberry") #works `$<-`(`[[`(a,1), "given", "huckleberry") #works

but when 

`[<-`(a, 1, `$<-`(`[`(a,1), "given", "huckleberry")) #works `[[<-`(a, 1, `$<-`(`[[`(a,1), "given", "huckleberry")) #no work

we see difference. special wrapping/unwrapping happens during retrieval not happen during assignment.

so what's going on "person" list of lists. outer list holds people , inner lists hold data. can think of data this

x<-list(     list(name="a"),list(name="b") )  y<-list(     list(name="c") )

where x collection of 2 people , y "single" person. when do

x[1]<-y x

you end with

list(     list(name="c"),list(name="b") )

since you're replacing list list how [ indexing works lists. if try replace element @ [[1]] list of lists, list nested. example

x[[1]]<-y x

becomes

x<-list(     list(list(name="c")),list(name="b") )

and level of nesting what's confusing r when goes print person in first position. first person won't have named elements @ second level, when goes print, return

emptyp <- structure(list(structure(list(), class="person")), class="person") utils:::format.person(emptyp) #  "  <> [] ()"

which gives symbols it's trying place name, e-mail address, role, , comment.


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