合并 2 个日期数据集

Question

可重现代码

library("zoo")  
library("xts")
x <- structure(c("2012-09-27 09:08:37", "2012-09-29 10:06:33", "2012-10-01 09:44:36","2012-10-04 14:37:05", "2012-10-15 13:18:21", "2012-10-17 17:33:46","2012-10-18 11:52:13", "2016-10-06 15:11:01", "2016-10-07 13:00:09","2016-10-07 12:20:57"), class = c("xts", "zoo"), .indexCLASS = "Date", tclass = "Date", .indexTZ = "UTC", tzone = "UTC", format = "%Y-%m-%d %H:%M:%S", index = structure(c(1348704000,1348876800, 1349049600, 1349308800, 1350259200, 1350432000, 1350518400,1475712000, 1475798400, 1475798400), tzone = "UTC", tclass = "Date"), .Dim = c(10L,1L)) 
y <- structure(c("1961-08-04 10:00:00", "1971-01-01 11:00:00", "1978-01-01 11:00:00","1979-01-01 11:00:00", "1983-01-01 11:00:00", "1984-01-01 11:00:00","1985-01-01 11:00:00", "2016-10-07 20:28:24", "2016-10-07 18:27:54","2016-10-08 00:38:40"), class = c("xts", "zoo"), .indexCLASS = "Date", tclass = "Date", .indexTZ = "UTC", tzone = "UTC", format = "%Y-%m-%d %H:%M:%S", index = structure(c(-265420800,31536000, 252460800, 283996800, 410227200, 441763200, 473385600,1475798400, 1475798400, 1475884800), tzone = "UTC", tclass = "Date"), .Dim = c(10L,1L)) 
x+y
#expected result
#  get results
#what happens
#Error in `+.default`(x, y) : non-numeric argument to binary operator

基本上，我有 2 个日期要相乘，这样我就只会看到相交的日期。

您可以在这个要点中找到代码 https://gist.github.com/baditaflorin/46b35b3044f69ed329e4c44067b7b246

现在 tclass 是日期，我使用

从 csv 文件导入数据

x <- xts(csv_file, format = "%Y-%m-%d %H:%M:%S",order.by=as.Date(csv_file))

我也试过转换数据但是出错了

x2 <- as.Date.POSIXlt( x , format = "%Y-%m-%d %H:%M:%S" , tz = "GMT") 

Error in as.POSIXlt.default(x, tz, ...) : 
  do not know how to convert 'x' to class “POSIXlt”

这些是我的会话信息：

R version 3.3.1 (2016-06-21)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Ubuntu 16.04.1 LTS

locale:
[1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C               LC_TIME=en_US.UTF-8        LC_COLLATE=en_US.UTF-8         LC_MONETARY=en_US.UTF-8   
[6] LC_MESSAGES=en_US.UTF-8    LC_PAPER=en_US.UTF-8           LC_NAME=C                  LC_ADDRESS=C                       LC_TELEPHONE=C            
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C       

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

other attached packages:
[1] devtools_1.12.0 xts_0.9-7       zoo_1.7-13     

loaded via a namespace (and not attached):
[1] httr_1.2.1      R6_2.2.0        tools_3.3.1     withr_1.0.2     curl_2.1        memoise_1.0.0   grid_3.3.1      digest_0.6.10  
[9] lattice_0.20-34

Answer 1

根据您的评论，您希望对两个 xts 对象的索引列进行交集或内部联接。

> intersect( index(x), index(y) )
[1] 17081
> as.Date( intersect( index(x), index(y) ) )
[1] "2016-10-07"

xts 中的合并默认为 "outer"，这与基本 R 合并功能不同，因此需要添加 "join" 规范：

> merge(x,y, join="inner")
           x                     y                    
2016-10-07 "2016-10-07 13:00:09" "2016-10-07 20:28:24"
2016-10-07 "2016-10-07 12:20:57" "2016-10-07 18:27:54"

合并 2 个日期数据集

Merge 2 date datasets

r

date

type-conversion

posixct

posixlt