制作好的列名R.

Question

我使用RODBC从Microsoft Access读取了一个表.一些变量的名称中包含空格.

R没有问题,但我做到了.我找不到如何指定空间

names(alltime)
 [1] "ID"            "LVL7"          "Ref Pv No"     "Ref Pv Name"   "DOS"           "Pt Last Name"  "Pt First Name" "MRN"           "CPT"           "CPT Desc"      "DxCd1"         "DxCd2"         "DxCd3"         "DxCd4"        
[15] "DOE"    

但是,如果我想做这样的事,我该怎么办？

> alltime[grep("MIDDLE EAR EXPLORE",alltime$CPT Desc,]
Error: unexpected symbol in "alltime[grep("MIDDLE EAR EXPLORE",alltime$CPT Desc"

Answer 1

另见 make.names

Answer 2

您可以引用列名称,例如

alltime$'CPT Desc'