从日期创建因子变量“周末"和“工作日" [英] Creating factor variables 'weekend' and 'weekday' from date

问题描述

我有以下数据框.这只是头部，日期跨越2个月.我的问题是如何在数据框中创建两个级别为工作日"和周末"的新因子变量，以指示给定的日期是工作日还是周末?

I have the following dataframe. This is just the head and the dates span over a period of 2 months. My question is how can I create a new factor variable in the dataframe with two levels, "weekday" and "weekend", indicating whether a given date is a weekday or weekend day?

    steps        date      interval
1 37.3826  2012-10-01             0
2 37.3826  2012-10-01             5
3 37.3826  2012-10-01            10
4 37.3826  2012-10-01            15
5 37.3826  2012-10-01            20
6 37.3826  2012-10-01            25

推荐答案

您可以使用 base R

df1$date <- as.Date(df1$date)
#create a vector of weekdays
weekdays1 <- c('Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday')
#Use `%in%` and `weekdays` to create a logical vector
#convert to `factor` and specify the `levels/labels`
df1$wDay <- factor((weekdays(df1$date) %in% weekdays1), 
         levels=c(FALSE, TRUE), labels=c('weekend', 'weekday') 
#Or
df1$wDay <- c('weekend', 'weekday')[(weekdays(df1$date) %in% weekdays1)+1L]

或者 isWeekday ， isWeekend 来自 timeDate .我们可以使用 wday 参数指定工作日.它返回一个逻辑向量，并且如果我们需要转换为如上所述的可能的字符串.

Or isWeekday, isWeekend from timeDate. We can specify the weekdays with wday argument. It returns a logical vector, and if we need to convert to strings that can be possible as showed above.

library(timeDate)
isWeekday(df1$date, wday=1:5)

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