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rboxplotstrsplit

R:strsplit to add names to boxplot raises an error

I am using strsplit in R to add names to boxplot but this gives me an error.

strng <- "one%two%three"
tt <- strsplit(strng,"%",fixed=TRUE)

and then 

boxplot(param~grp,data=snp,horizontal=TRUE,names=tt)

this yields

ls = list(c("one", "two",  :
  'at' and 'labels' lengths differ, 3 != 1
Calls: boxplot ... boxplot.default -> do.call -> bxp -> do.call -> axis
Execution halted

the names argument requires a vector and strsplit returns a list. Are these incompatible?

If I do

boxplot(param~grp,data=snp,horizontal=TRUE,names=c("on","two","three"))

Then it is ok.

Thanks a lot for your help

Solution

  • Use tt[[1]] or unlist(tt) instead of tt

    boxplot(param~grp,data=snp,horizontal=TRUE,names=tt[[1]])

    names argument is expecting a vector and tt is a list, so you need to pass a vector not a list.