Question

在r中如何通过引用员工的姓名选择数据行：ALEX，BRAD或带变量的JOHN？

从下面的代码我得到：

missing value where TRUE/FALSE needed.
emp1["ALEX","mon"] 
[1] NA

csv示例 -

*  X.name mon tue wed thu fri
1   ALEX  98  95  73  88  18
2   BRAD  66  25  72   8  32
3   JOHN  22  41  78  43  36

    emp1 <- read.csv("C:/Database/data/emp1.csv",as.is=TRUE)
    emp2 <- read.csv("C:/Database/data/emp2.csv",as.is=TRUE)
    employeename<-"ALEX"
        if (emp1[employeename,"mon"] > emp2["2","mon"] & emp1["2","mon"]> emp2["3","mon"]) result<- "SUCCESS" else 

    result<-"fail"
    print (result)

Answer 1

除了指定列之外，您还可以更改rownames并删除第一列，这样您就可以像之前调用的那样调用行和列。

> rownames(emp1) <- emp1$X.name
> emp1 <- emp1[,-1]
> emp1["ALEX", "mon"]
## [1] 98

Answer 2

您必须指定列，在本例中为X.name：

emp1[emp1$X.name == "ALEX", "mon"]

或

employeename <- "ALEX"
emp1[emp1$X.name == employeename, "mon"]

如何使用变量在r中指定一行数据

2 个答案: