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我正在编写几周前开始的代码。但是，（我不确定为什么）代码突然将某些列转换为 integer64 格式。使用这种格式，其余代码不再运行，而且我不熟悉 integer64 格式。我只想将 integer64 列转换为整数或数字格式。通常的命令 as.numeric 或 as.integer 不起作用。我能做些什么？

这是我的数据样本

> dput(head(my_data3, n = 30))
structure(list(year = c(2007, 2009, 2011, 2012, 2005, 2017, 2001, 
2004, 2005, 2006, 2007, 2008, 2010, 2011, 2012, 2013, 2014, 2016, 
2017, 2018, 2018, 2011, 2014, 2002, 2015, 2004, 2008, 2009, 2011, 
2012), export_value = structure(c(0, 0, 0, 0, 5.74548939548786e-319, 
3.29556607745487e-319, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2.20704064653743e-319, 
0, 0, 0, 3.13731685109192e-320, 3.82307996751957e-320, 0, 0, 
1.39406056696212e-318, 7.3185450052818e-319, 1.72873569479852e-320, 
7.06760906375903e-320, 1.04667807071468e-319, 2.30382810655773e-320, 
1.01915861424132e-319), class = "integer64"), location_code = c("AGO", 
"AGO", "AGO", "AGO", "MDG", "MDG", "MOZ", "MOZ", "MOZ", "MOZ", 
"MOZ", "MOZ", "MOZ", "MOZ", "MOZ", "MOZ", "MOZ", "MOZ", "MOZ", 
"MOZ", "SWZ", "SYC", "SYC", "TZA", "TZA", "ZAF", "ZAF", "ZAF", 
"ZAF", "ZAF"), partner_code = c("AFG", "AFG", "AFG", "AFG", "AFG", 
"AFG", "AFG", "AFG", "AFG", "AFG", "AFG", "AFG", "AFG", "AFG", 
"AFG", "AFG", "AFG", "AFG", "AFG", "AFG", "AFG", "AFG", "AFG", 
"AFG", "AFG", "AFG", "AFG", "AFG", "AFG", "AFG"), export_destination = c("RoW", 
"RoW", "RoW", "RoW", "RoW", "RoW", "RoW", "RoW", "RoW", "RoW", 
"RoW", "RoW", "RoW", "RoW", "RoW", "RoW", "RoW", "RoW", "RoW", 
"RoW", "RoW", "RoW", "RoW", "RoW", "RoW", "RoW", "RoW", "RoW", 
"RoW", "RoW"), product_group = c("Food", "Food", "Food", "Food", 
"Food", "Food", "Food", "Food", "Food", "Food", "Food", "Food", 
"Food", "Food", "Food", "Food", "Food", "Food", "Food", "Food", 
"Food", "Food", "Food", "Food", "Food", "Food", "Food", "Food", 
"Food", "Food"), exporter = c("Angola", "Angola", "Angola", "Angola", 
"Madagascar", "Madagascar", "Mozambique", "Mozambique", "Mozambique", 
"Mozambique", "Mozambique", "Mozambique", "Mozambique", "Mozambique", 
"Mozambique", "Mozambique", "Mozambique", "Mozambique", "Mozambique", 
"Mozambique", "Eswatini", "Seychelles", "Seychelles", "Tanzania", 
"Tanzania", "South Africa", "South Africa", "South Africa", "South Africa", 
"South Africa"), export_destination_country = c("Afghanistan", 
"Afghanistan", "Afghanistan", "Afghanistan", "Afghanistan", "Afghanistan", 
"Afghanistan", "Afghanistan", "Afghanistan", "Afghanistan", "Afghanistan", 
"Afghanistan", "Afghanistan", "Afghanistan", "Afghanistan", "Afghanistan", 
"Afghanistan", "Afghanistan", "Afghanistan", "Afghanistan", "Afghanistan", 
"Afghanistan", "Afghanistan", "Afghanistan", "Afghanistan", "Afghanistan", 
"Afghanistan", "Afghanistan", "Afghanistan", "Afghanistan")), row.names = c(NA, 
-30L), class = c("data.table", "data.frame"), .internal.selfref = <pointer: 0x00000295b7981ef0>)
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1 回答 1

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integer64 类由 bit64 包创建。多年来出现的许多问题已在 SO 上得到解答。需要使用创建 integer64 对象的包中的函数来恢复数据而不进行修改。

 library(bit64)
 ?integer64
 # You might imagine that as.numeric should have an integer64 method.
 # ....  but like me you would have been wrong
 #Instead, division is defined for integer64 objects and it returns a double.
 # .... so divide by 1 ( if and only if you have installed and loaded pkg:bit64

  my_data3$export_value/1
 [1]      0      0      0      0 116290  66703      0      0      0      0      0      0      0      0      0  44671
 [17]      0      0      0   6350   7738      0      0 282161 148129   3499  14305  21185   4663  20628

我之前没有注意到为“integer64”对象定义了一个as.integer和一个as.double泛型，所以使用它们可能会更好。当然，如果需要一个整数，最好从 . 开始as.integer。

我想那些较早的问题和答案中的一个或多个可能包含对这个问题的答案，但在我查看的前 5 个中我没有遇到重复项。

于 2021-11-18T18:28:23.420 回答