如何从字符串列表（引用键）中获取单个字符串（pandoc引用）

Question

I'm working with a list object consisting of a variable number of citation keys.

mylist <- structure(list(steele1998pulsus = "steele1998pulsus", wright1997evaluation = "wright1997evaluation", wright1996continuous = "wright1996continuous"), .Names = c("steele1998pulsus", "wright1997evaluation", "wright1996continuous")) 

paste0("@", unlist(mylist)) 

generates:

[1] "@steele1998pulsus"     "@wright1997evaluation" "@wright1996continuous"

I've tried various combinations of cat() and paste() without success - my goal is a text string formatted as below (a pandoc citation of multiple keys).

[@steele1998pulsus; @wright1997evaluation; @wright1996continuous]

Answer 1

I'm not great with R's string-processing commands (I find it very hard to remember the difference between collapse and sep ) but I can do it like this:

paste("[", paste(paste0("@", mylist), collapse="; "), "]", sep="")

Producing the desired output:

> paste("[", paste(paste0("@", mylist), collapse="; "), "]", sep="")
[1] "[@steele1998pulsus; @wright1997evaluation; @wright1996continuous]"

Also, because we don't need the sep argument for any of the steps we can just use paste0 for all of them:

paste0("[", paste0(paste0("@", mylist), collapse="; "), "]")