关于 r：使用 dplyr 我们可以仅将数据类型为整数的列更改为数字数据类型吗

using dplyr can we change to numeric data type only those columns for which data type is integer

我想知道是否有任何方法可以使用 dplyr 或基本包仅将整数数据类型的列转换为数字？

我的数据集是这样的：

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structure(list(V1 = c("AA0101","AA0101","AA0102","AA0102","AA0103","AA0103"),
V2 = 38080:38085,
V3 = c(0L, 50353564L, 13000567L, 50395060L, 0L, 0L),
V4 = c(0L, 2L, 2L, 1L, 0L, 0L),
V5 = c("PS","NW","PS","NW","PS","NW"),
V6 = c("4/1/2019","4/1/2019","4/1/2019","4/1/2019","4/1/2019","4/1/2019"),
V7 = c("20:06:04","20:22:17","20:41:53","21:31:04","21:58:51","23:08:04"),
V8 = c("20:06:14","20:22:22","20:41:58","21:31:11","21:59:01","23:08:10"),
V9 = c(10L, 5L, 5L, 7L, 10L, 6L),
V10 = c("0:00:00","20:22:22","20:41:58","21:31:11","0:00:00","0:00:00"),
V11 = c("0:00:00","20:23:58","20:42:55","21:31:31","0:00:00","0:00:00"),
V12 = c(0L, 96L, 57L, 20L, 0L, 0L),
V13 = c("AGENT","AGENT","AGENT","AGENT","AGENT","HANG"),
V14 = c("20:06:13","20:23:57","20:42:54","21:31:30","21:59:00","0:00:00"),
V15 = c("20:08:07","20:25:41","20:43:43","21:34:52","22:01:03","0:00:00"),
V16 = c(114L, 104L, 49L, 202L, 123L, 0L),
V17 = c("DORIT","SHLOMO","DORIT","ZOHARI","DORIT","NO_SERVER")))

当我这样做时：

str(dat)

它返回给我以下信息：

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Classes ‘data.table’ and 'data.frame': 6 obs. of 17 variables:
$ V1 : chr "AA0101""AA0101""AA0102""AA0102" ...
$ V2 : int 38080 38081 38082 38083 38084 38085
$ V3 : int 0 50353564 13000567 50395060 0 0
$ V4 : int 0 2 2 1 0 0
$ V5 : chr "PS""NW""PS""NW" ...
$ V6 : chr "4/1/2019""4/1/2019""4/1/2019""4/1/2019" ...
$ V7 : chr "20:06:04""20:22:17""20:41:53""21:31:04" ...
$ V8 : chr "20:06:14""20:22:22""20:41:58""21:31:11" ...
$ V9 : int 10 5 5 7 10 6
$ V10: chr "0:00:00""20:22:22""20:41:58""21:31:11" ...
$ V11: chr "0:00:00""20:23:58""20:42:55""21:31:31" ...
$ V12: int 0 96 57 20 0 0
$ V13: chr "AGENT""AGENT""AGENT""AGENT" ...
$ V14: chr "20:06:13""20:23:57""20:42:54""21:31:30" ...
$ V15: chr "20:08:07""20:25:41""20:43:43""21:34:52" ...
$ V16: int 114 104 49 202 123 0
$ V17: chr "DORIT""SHLOMO""DORIT""ZOHARI" ...
- attr(*,".internal.selfref")=<externalptr>