如何用特殊字符连接数据框的行名？

Question

I would like to concatenate the row names of a data frame with a "+" to return a string. For example

head(USArrests)

           Murder Assault UrbanPop Rape
Alabama      13.2     236       58 21.2
Alaska       10.0     263       48 44.5
Arizona       8.1     294       80 31.0
Arkansas      8.8     190       50 19.5
California    9.0     276       91 40.6
Colorado      7.9     204       78 38.7

My goal is to get

goal = Alabama+Alaska+Arizona+Arkansas+California+Colorado+...

I tried

goal = paste0(rownames(USArrests), sep="+")

head(goal)
[1] "Alabama+"    "Alaska+"     "Arizona+"    "Arkansas+"   "California+"     "Colorado+"

I am relatively new to R and am lost on how to get the one I wanted. Could someone help me? Thanks!

Answer 1

paste(rownames(USArrests), collapse="+")