1、attach()
假設(shè)data.frame包含列name,age
attach(onedata.frame)后就可以引用直接引用onedata.frame中的元素了栖雾,例如:
(1)創(chuàng)建測(cè)試數(shù)據(jù)框
> name<-c("Zhangshan","Lisi","Wangwu","Zhaoliu")
> age<-c(20,30,40,50)
> onedata.frame<-data.frame(name,age)
> onedata.frame
?????? name age
1 Zhangshan? 20
2????? Lisi? 30
3??? Wangwu? 40
4?? Zhaoliu? 50
(2)attach測(cè)試
> attach(onedata.frame)
The following objects are masked _by_ .GlobalEnv:
??? age, name
> age
[1] 20 30 40 50
> name
[1] "Zhangshan" "Lisi"????? "Wangwu"??? "Zhaoliu" ?
> detach(onedata.frame)
> name
錯(cuò)誤: 找不到對(duì)象'name'
可見赚爵,訪問數(shù)據(jù)框中的元素只在命令attach()和detach()之間可以搜索到。
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作者:hongweigg
來源:CSDN
原文:https://blog.csdn.net/hongweigg/article/details/48093577
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