我遇到的情况是我将数据从字符转换为整数。然而,在一台机器上,相同的代码产生的结果与另一台机器上的结果不同,而我却为此而感到茫然。这是一个例子:
df <- data.frame(
a = "1", b = "2", c = "3",
stringsAsFactors = FALSE
)
现在,在我的本地计算机上,以下工作正常:
df[,c("a","b")] <- sapply(df[,c("a","b")], as.integer)
str(df)
'data.frame': 1 obs. of 3 variables:
$ a: int 1
$ b: int 2
$ c: chr "3"
但是在远程计算机上,同一行代码返回:
df[,c("a","b")] <- sapply(df[,c("a","b")], as.integer)
str(df)
'data.frame': 1 obs. of 3 variables:
$ a: chr "1"
$ b: chr "2"
$ c: chr "3"
我发现这很奇怪,我无法想出任何好的理由。我查看了sys.info(),两者之间的所有包都是一样的。与区域设置相同。唯一的区别是R的版本和Ubuntu的版本
我的机器:R 3.2.2,Ubuntu 15.10
R version 3.2.2 (2015-08-14)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Ubuntu 15.10
locale:
[1] LC_CTYPE=C LC_NUMERIC=C LC_TIME=C
[4] LC_COLLATE=C LC_MONETARY=C LC_MESSAGES=en_CA.UTF-8
[7] LC_PAPER=en_CA.UTF-8 LC_NAME=C LC_ADDRESS=C
[10] LC_TELEPHONE=C LC_MEASUREMENT=en_CA.UTF-8 LC_IDENTIFICATION=C
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] dplyr_0.4.3 tidyr_0.4.1 data.table_1.9.6
[4] RMySQL_0.9-3 DBI_0.3.1
loaded via a namespace (and not attached):
[1] Rcpp_0.12.3 codetools_0.2-14 psych_1.5.8 foreach_1.4.3
[5] assertthat_0.1 plyr_1.8.3 chron_2.3-47 R6_2.1.2
[9] magrittr_1.5 lazyeval_0.1.10 doParallel_1.0.10 iterators_1.0.8
[13] tools_3.2.2 yaml_2.1.13 parallel_3.2.2 mnormt_1.5-3
远程:R 3.2.4,Ubuntu 12.04
R version 3.2.4 (2016-03-10)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Ubuntu precise (12.04.5 LTS)
locale:
[1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C LC_TIME=C LC_COLLATE=C
[5] LC_MONETARY=C LC_MESSAGES=C LC_PAPER=C LC_NAME=C
[9] LC_ADDRESS=C LC_TELEPHONE=C LC_MEASUREMENT=C LC_IDENTIFICATION=C
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] dplyr_0.4.3 tidyr_0.4.1 data.table_1.9.6
[4] RMySQL_0.9-3 DBI_0.3.1
loaded via a namespace (and not attached):
[1] Rcpp_0.12.3 codetools_0.2-14 psych_1.4.8.11 foreach_1.4.2 assertthat_0.1
[6] plyr_1.8.1 chron_2.3-47 R6_2.0.1 magrittr_1.5 lazyeval_0.1.10
[11] doParallel_1.0.8 iterators_1.0.7 tools_3.2.4 yaml_2.1.13 parallel_3.2.4
思想?