r - dplyr 0.3.0.2 rename() 习惯用法在加载 reshape 包时不稳定

Question

sessionInfo()
# R version 3.1.1 (2014-07-10)
# Platform: x86_64-apple-darwin10.8.0 (64-bit)
# 
# attached base packages:
#   [1] stats     graphics  grDevices utils     datasets  methods   base     
# 
# other attached packages:
#   [1] dplyr_0.3.0.2
# 
# loaded via a namespace (and not attached):
#   [1] assertthat_0.1 DBI_0.3.1      lazyeval_0.1.9 magrittr_1.0.1 parallel_3.1.1 Rcpp_0.11.3   
# [7] tools_3.1.1  

当仅加载 dplyr 0.3.0.2 时，默认的重命名习语有效。

packageVersion("dplyr")
# [1] ‘0.3.0.2’
iris[1:10,] %>% rename(petal_length = Petal.Length)
#    Sepal.Length Sepal.Width petal_length Petal.Width Species
# 1           5.1         3.5          1.4         0.2  setosa
# 2           4.9         3.0          1.4         0.2  setosa

加载 library(reshape) 时，习语似乎不起作用

# other attached packages:
#   [1] reshape_0.8.5 dplyr_0.3.0.2
# 
# loaded via a namespace (and not attached):
#   [1] assertthat_0.1   chron_2.3-45     data.table_1.9.5 DBI_0.3.1        lazyeval_0.1.9  
# [6] magrittr_1.0.1   parallel_3.1.1   plyr_1.8.1       Rcpp_0.11.3      reshape2_1.4    
# [11] stringr_0.6.2    tidyr_0.1        tools_3.1.1     

iris[1:10,] %>% rename(petal_length = Petal.Length)
# Error in rename(`iris[1:10, ]`, petal_length = Petal.Length) : 
#   unused argument (petal_length = Petal.Length)

并且需要使用下面的代码

iris[1:10,] %>% rename(c("Petal.Length" = "petal_length"))
#    Sepal.Length Sepal.Width petal_length Petal.Width Species
# 1           5.1         3.5          1.4         0.2  setosa
# 2           4.9         3.0          1.4         0.2  setosa

这是一个错误吗？

Answer 1

我推荐data.table::setnames功能。

iris %>% 
data.table::setnames(
    old = "Petal_length",
    new = "petal_length") %>% 
  head