tidyr UNNEST R错误在captureDots（）：该参数已经被评估

Question

，收到以下错误，当我请从unnest文档的例子：

Error in captureDots() : the argument has already been evaluated。

我也在这里得到错误的例子：https://blog.rstudio.org/2016/02/02/tidyr-0-4-0/。

> version 
       _       
platform  x86_64-apple-darwin13.4.0 
arch   x86_64      
os    darwin13.4.0     
system   x86_64, darwin13.4.0   
status          
major   3       
minor   3.2       
year   2016       
month   10       
day   31       
svn rev  71607      
language  R       
version.string R version 3.3.2 (2016-10-31) 
nickname  Sincere Pumpkin Patch  
> library(tidyr) 
> library(dplyr) 

Attaching package: ‘dplyr’ 

The following objects are masked from ‘package:stats’: 

    filter, lag 

The following objects are masked from ‘package:base’: 

    intersect, setdiff, setequal, union 

> df <- data_frame(
+  x = 1:3, 
+  y = c("a", "d,e,f", "g,h") 
+) 
> df %>% 
+  transform(y = strsplit(y, ",")) %>% 
+  unnest(y) 
    x y 
1 1 a 
2 2 d 
3 2 e 
4 2 f 
5 3 g 
6 3 h 
> 
> # Or just 
> df %>% 
+  unnest(y = strsplit(y, ",")) 
# A tibble: 6 × 2 
     x  y 
    <int> <chr> 
1  1  a 
2  2  d 
3  2  e 
4  2  f 
5  3  g 
6  3  h 
> 
> # It also works if you have a column that contains other data frames! 
> df <- data_frame(
+  x = 1:2, 
+  y = list(
+   data_frame(z = 1), 
+   data_frame(z = 3:4) 
+ ) 
+) 
> df %>% unnest(y) 
Error in captureDots() : the argument has already been evaluated 

Answer 1

安装最新版本dplyr，tidyr和tidyverse和有R 3.2.2现在的作品。