R chron times（）函數不起作用

Question

我正試圖將時間從午夜轉換為秒。 我很難從chron包中獲取times（）函數。 這是我使用它的方式：

> library(chron)
> 24 * 24 * 60 * (times(50))
Error in 24 * 24 * 60 * (times(50)) : 
  non-numeric argument to binary operator
> 
>  
> library(chron)
> 24 * 24 * 60  times(5000)
Error: unexpected symbol in "24 * 24 * 60  times"

有什么建議？

更新：

> sessionInfo()
R version 2.14.0 (2011-10-31)
Platform: i386-pc-mingw32/i386 (32-bit)

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

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

other attached packages:
[1] RODBC_1.3-3        nnet_7.3-1         doSNOW_1.0.3       foreach_1.3.0     
[5] codetools_0.2-8    iterators_1.0.3    snow_0.3-7         randomForest_4.6-2
[9] chron_2.3-42      

loaded via a namespace (and not attached):
[1] tools_2.14.0

更新2：

> find("times")
[1] "package:foreach" "package:chron"  
> times
function (n) 
{
    if (!is.numeric(n) || length(n) != 1) 
        stop("n must be a numeric value")
    foreach(icount(n), .combine = "c")
}
<environment: namespace:foreach>

更新3：

> sessionInfo()
R version 2.14.0 (2011-10-31)
Platform: i386-pc-mingw32/i386 (32-bit)

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

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

other attached packages:
[1] chron_2.3-42
> find("times")
[1] "package:chron"
> 24 * 24 * 60 * (times * (50))
Error in times * (50) : non-numeric argument to binary operator

Answer 1

問題是package:foreach還包含一個名為times的函數。 而且因為它出現在你的搜索路徑上的package:chron之前，它'掩蓋'你真正想要的times函數。

換句話說，當R執行動態搜索符號times ，它會找到匹配（在這種情況下是錯誤的匹配），然后才能找到與您想要查找的函數關聯的匹配項。

您可以通過啟動新的R會話，然后鍵入以下內容來查看：

> library(chron)
> library(foreach)
Loading required package: iterators
Loading required package: codetools
foreach: simple, scalable parallel programming from Revolution Analytics
Use Revolution R for scalability, fault tolerance and more.
http://www.revolutionanalytics.com

Attaching package: ‘foreach’

The following object(s) are masked from ‘package:chron’:

    times

如果你確實需要附加兩個軟件包，你可以通過以下方式確保獲得正確的times()版本：反轉軟件包的連接順序（OK但不是很好）; 或者（更好）通過鍵入chron::times顯式指定所需的函數，如：

24 * 24 * 60 * (chron::times(50))