如何将一周中的天数转换为 R 数据框列中的数字？
要将一周中的天数转换为R数据框列中的数字，我们需要通过将工作日定义为级别来将该列转换为因子，然后将该列读取为整数。
如果我们在转换期间提供正确的工作日顺序，则星期一将转换为1。查看以下示例以了解如何完成。
示例1
以下代码段创建了一个示例数据框-
Week_Days<-
sample(c("Monday","Tuesday","Wednesday","Thursday","Friday","Saturday","Sunday"),20,replace=TRUE)
df1<-data.frame(Week_Days)
df1创建了以下数据框
Week_Days 1 Friday 2 Monday 3 Tuesday 4 Saturday 5 Thursday 6 Tuesday 7 Monday 8 Thursday 9 Thursday 10 Friday 11 Thursday 12 Sunday 13 Thursday 14 Tuesday 15 Wednesday 16 Sunday 17 Friday 18 Wednesday 19 Sunday 20 Thursday
要将df1中的Week_Days转换为数字并在上面创建的数据框中的不同列中读取它们，请将以下代码添加到上面的代码段中-
Week_Days<-
sample(c("Monday","Tuesday","Wednesday","Thursday","Friday","Saturday","Sunday"),20,replace=TRUE)
df1<-data.frame(Week_Days)
df1$Days_Number<-
as.integer(factor(df1$Week_Days,levels=c("Monday","Tuesday","Wednesday","Thursd
ay","Friday","Saturday","Sunday"),ordered=TRUE))
df1创建了以下数据框
Week_Days Days_Number 1 Friday 5 2 Monday 1 3 Tuesday 2 4 Saturday 6 5 Thursday 4 6 Tuesday 2 7 Monday 1 8 Thursday 4 9 Thursday 4 10 Friday 5 11 Thursday 4 12 Sunday 7 13 Thursday 4 14 Tuesday 2 15 Wednesday 3 16 Sunday 7 17 Friday 5 18 Wednesday 3 19 Sunday 7 20 Thursday 4
示例2
以下代码段创建了一个示例数据框-
Time<-
sample(c("Monday","Tuesday","Wednesday","Thursday","Friday","Saturday","Sunday"),20,replace=TRUE)
df2<-data.frame(Time)
df2创建了以下数据框
Time 1 Tuesday 2 Thursday 3 Monday 4 Tuesday 5 Thursday 6 Sunday 7 Saturday 8 Monday 9 Thursday 10 Saturday 11 Wednesday 12 Monday 13 Wednesday 14 Sunday 15 Sunday 16 Sunday 17 Sunday 18 Wednesday 19 Saturday 20 Friday
要将df2中的时间转换为数字并在上面创建的数据框中的不同列中读取它们，请将以下代码添加到上面的代码段中-
Time<-
sample(c("Monday","Tuesday","Wednesday","Thursday","Friday","Saturday","Sunday"),20,replace=TRUE)
df2<-data.frame(Time)
df2$Day_Number<-
as.integer(factor(df2$Time,levels=c("Monday","Tuesday","Wednesday","Thursday","
Friday","Saturday","Sunday"),ordered=TRUE))
df2输出结果如果您将上述所有给定的片段作为单个程序执行，它会生成以下输出-
Time Day_Number 1 Tuesday 2 2 Thursday 4 3 Monday 1 4 Tuesday 2 5 Thursday 4 6 Sunday 7 7 Saturday 6 8 Monday 1 9 Thursday 4 10 Saturday 6 11 Wednesday 3 12 Monday 1 13 Wednesday 3 14 Sunday 7 15 Sunday 7 16 Sunday 7 17 Sunday 7 18 Wednesday 3 19 Saturday 6 20 Friday 5