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Redis系列学习文章分享---第十四篇(Redis多级缓存--封装Http请求+向tomcat发送http请求+根据商品id对tomcat集群负载均衡)

扒皮狼 03-26 13:00 阅读 2
r语言

R语言的赋值符号有<-、=、->、<<-、->>六种,它们的使用与区别如下:

总结:

'<-'和'='是最常用的赋值符号,它们的作用相同,但函数调用和参数传递时使用'='进行赋值;

`->`和`->>`相对较少使用;

`<<-`则具有特殊的全局赋值功能,在一般情况下应当谨慎使用。

StudentData <- data.frame(name = c("Linda","Summer","Tom","Bob"),
                          age = c(18,19,17,18),
                          gender = c("W","W","M","M"),
                          range = c("B","A","B","B")
                          )
StudentData

参数传递时应“=”,运行结果为:正确形式

StudentData <- data.frame(name <-  c("Linda","Summer","Tom","Bob"),
                          age <-  c(18,19,17,18),
                          gender <-  c("W","W","M","M"),
                          range <-  c("B","A","B","B")
                          )
StudentData

参数传递时应“<-”运行结果:

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