setkeyv与data.table中的异常错误 [英] Unusual error in setkeyv with data.table

问题描述

我会让自己非常熟悉 data.table ，但在 setkeyv 中遇到一个奇怪的错误，

错误很简单：

 <$> c $ c> keycols <-c（A，B）
 DT < -  data.table（A = 1：10，B = 91：90）
 setkeyv ）
＃setkeyv（x，cols，verbose = verbose，physical = physical）中的错误：
传递给.Internal（nchar）的4个参数，需要3 
  

作为参考，这是我的 sessionInfo（）：

  R版本3.2.0（2015-04-16）
平台：x86_64-w64-mingw32 / x64（64位）
运行时：Windows 7 x64（build 7601）Service Pack 1 
 
 locale：
 [1] LC_COLLATE = English_United States.1252 LC_CTYPE = English_United States.1252 LC_MONETARY = English_United States.1252 
 [4] LC_NUMERIC = C LC_TIME = English_United States.1252 
 
附加的基本包：
 [1] stats graphics grDevices utils数据集方法base 
 
其他软件包：
 [1] cvTools_0.3.2 robustbase_0.92-4 lattice_0.20-31 kernlab_0.9-20 rstan_2.6.0 inline_0.3.14 Rcpp_0.11.6 data.table_1.9.4 
 
通过命名空间（而不是附加）：
 [1] chron_2.3-47 grid_3.2.0 plyr_1.8.3 stats4_3.2.0 magrittr_1.5 stringi_0.5-4 reshape2_1.4.1 tools_3.2.0 stringr_1.0.0 
 [10] DEoptimR_1.0-2 
  

解决方案没有解释为什么是这种情况，但升级到R 3.2.1和安装最新版本的每个包解决了问题。作为参考，这是我更新后的 sessionInfo（）：

  R版本3.2.1（2015-06-18）
平台：x86_64-w64-mingw32 / x64（64位）
运行环境：Windows 7 x64（build 7601）Service Pack 1 
 
 locale：
 [1] LC_COLLATE = English_United States.1252 LC_CTYPE = English_United States.1252 LC_MONETARY = English_United States.1252 
 [4] LC_NUMERIC = C LC_TIME = English_United States.1252 
 
附加的基本包：
 [1] stats graphics grDevices utils数据集方法base 
 
其他附加包：
 [1] kernlab_0.9-20 rstan_2.6.0 inline_0.3.14 Rcpp_0.11.6 cvTools_0.3.2 robustbase_0.92-4 lattice_0.20-31 data.table_1.9.4 
 
通过命名空间加载（未附加）：
 [1] chron_2 .3-47 grid_3.2.1 plyr_1.8.3 stats4_3.2.1 magrittr_1.5 stringi_0.5-4 reshape2_1.4.1 tools_3.2.1 stringr_1.0.0 
 [10] DEoptimR_1.0-2 
  

I'd consdier myself very familiar with data.table, but have encountered a strange error in the setkeyv function that I can't sort out.

The error is very straightforward:

keycols<-c("A", "B")
DT <- data.table(A=1:10, B=91:90)
setkeyv(DT, keycols)
# Error in setkeyv(x, cols, verbose = verbose, physical = physical) : 
#   4 arguments passed to .Internal(nchar) which requires 3

For reference, this is my sessionInfo():

R version 3.2.0 (2015-04-16)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 7 x64 (build 7601) Service Pack 1

locale:
[1] LC_COLLATE=English_United States.1252  LC_CTYPE=English_United States.1252    LC_MONETARY=English_United States.1252
[4] LC_NUMERIC=C                           LC_TIME=English_United States.1252    

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] cvTools_0.3.2     robustbase_0.92-4 lattice_0.20-31   kernlab_0.9-20    rstan_2.6.0       inline_0.3.14     Rcpp_0.11.6       data.table_1.9.4 

loaded via a namespace (and not attached):
 [1] chron_2.3-47   grid_3.2.0     plyr_1.8.3     stats4_3.2.0   magrittr_1.5   stringi_0.5-4  reshape2_1.4.1 tools_3.2.0    stringr_1.0.0 
[10] DEoptimR_1.0-2

解决方案

I have no explanation for why this is the case, but upgrading to R 3.2.1 and installing the latest version of every package resolves the issue. For reference, this is my sessionInfo() after updating:

R version 3.2.1 (2015-06-18)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 7 x64 (build 7601) Service Pack 1

locale:
[1] LC_COLLATE=English_United States.1252  LC_CTYPE=English_United States.1252    LC_MONETARY=English_United States.1252
[4] LC_NUMERIC=C                           LC_TIME=English_United States.1252    

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] kernlab_0.9-20    rstan_2.6.0       inline_0.3.14     Rcpp_0.11.6       cvTools_0.3.2     robustbase_0.92-4 lattice_0.20-31   data.table_1.9.4 

loaded via a namespace (and not attached):
 [1] chron_2.3-47   grid_3.2.1     plyr_1.8.3     stats4_3.2.1   magrittr_1.5   stringi_0.5-4  reshape2_1.4.1 tools_3.2.1    stringr_1.0.0 
[10] DEoptimR_1.0-2

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