如何通过使用R中的开始日期创建日期序列？
创建任何序列的最佳方法是在seq函数的帮助下进行创建，这也适用于日期序列。但是对于日期，我们需要以日期格式读取日期，以便R可以理解输入类型并创建适当的向量。如果我们不使用日期格式作为日期值，那么对R来说就没有意义，并且会导致错误。
例子
x1<-seq(as.Date("2020-01-01"),by="day",length.out=5)
x1输出结果
[1] "2020-01-01" "2020-01-02" "2020-01-03" "2020-01-04" "2020-01-05"
例子
x2<-seq(as.Date("2020-02-01"),by="day",length.out=29)
x2输出结果
[1] "2020-02-01" "2020-02-02" "2020-02-03" "2020-02-04" "2020-02-05" [6] "2020-02-06" "2020-02-07" "2020-02-08" "2020-02-09" "2020-02-10" [11] "2020-02-11" "2020-02-12" "2020- 02-13" "2020-02-14" "2020-02-15" [16] "2020-02-16" "2020-02-17" "2020-02-18" "2020-02-19" "2020-02-20" [21] "2020-02-21" "2020-02-22" "2020-02-23" "2020-02-24" "2020-02-25" [26] "2020-02-26" "2020-02-27" "2020-02-28" "2020-02-29"
例子
x3<-seq(as.Date("2020-02-01"),by="day",length.out=30)
x3输出结果
[1] "2020-02-01" "2020-02-02" "2020-02-03" "2020-02-04" "2020-02-05" [6] "2020-02-06" "2020-02-07" "2020-02-08" "2020-02-09" "2020-02-10" [11] "2020-02-11" "2020-02-12" "2020-02-13" "2020-02-14" "2020-02-15" [16] "2020-02-16" "2020-02-17" "2020-02-18" "2020-02-19" "2020-02-20" [21] "2020-02-21" "2020-02-22" "2020-02-23" "2020-02-24" "2020-02-25" [26] "2020-02-26" "2020-02-27" "2020-02-28" "2020-02-29" "2020-03-01"
例子
x4<-seq(as.Date("2020-03-01"),by="day",length.out=31)
x4输出结果
[1] "2020-03-01" "2020-03-02" "2020-03-03" "2020-03-04" "2020-03-05" [6] "2020-03-06" "2020-03-07" "2020-03-08" "2020-03-09" "2020-03-10" [11] "2020-03-11" "2020-03-12" "2020-03-13" "2020-03-14" "2020-03-15" [16] "2020-03-16" "2020-03-17" "2020-03-18" "2020-03-19" "2020-03-20" [21] "2020-03-21" "2020-03-22" "2020-03-23" "2020-03-24" "2020-03-25" [26] "2020-03-26" "2020-03-27" "2020-03-28" "2020-03-29" "2020-03-30" [31] "2020-03-31"
例子
x5<-seq(as.Date("2020-04-01"),by="day",length.out=60)
x5输出结果
[1] "2020-04-01" "2020-04-02" "2020-04-03" "2020-04-04" "2020-04-05" [6] "2020-04-06" "2020-04-07" "2020-04-08" "2020-04-09" "2020-04-10" [11] "2020-04-11" "2020-04-12" "2020-04-13" "2020-04-14" "2020-04-15" [16] "2020-04-16" "2020-04-17" "2020-04-18" "2020-04-19" "2020-04-20" [21] "2020-04-21" "2020-04-22" "2020-04-23" "2020-04-24" "2020-04-25" [26] "2020-04-26" "2020-04-27" "2020-04-28" "2020-04-29" "2020-04-30" [31] "2020-05-01" "2020-05-02" "2020-05-03" "2020-05-04" "2020-05-05" [36] "2020-05-06" "2020-05-07" "2020-05-08" "2020-05-09" "2020-05-10" [41] "2020-05-11" "2020-05-12" "2020-05-13" "2020-05-14" "2020-05-15" [46] "2020-05-16" "2020-05-17" "2020-05-18" "2020-05-19" "2020-05-20" [51] "2020-05-21" "2020-05-22" "2020-05-23" "2020-05-24" "2020-05-25" [56] "2020-05-26" "2020-05-27" "2020-05-28" "2020-05-29" "2020-05-30"
例子
x6<-seq(as.Date("2020-05-15"),by="day",length.out=30)
x6输出结果
[1] "2020-05-15" "2020-05-16" "2020-05-17" "2020-05-18" "2020-05-19" [6] "2020-05-20" "2020-05-21" "2020-05-22" "2020-05-23" "2020-05-24" [11] "2020-05-25" "2020-05-26" "2020-05-27" "2020-05-28" "2020-05-29" [16] "2020-05-30" "2020-05-31" "2020-06-01" "2020-06-02" "2020-06-03" [21] "2020-06-04" "2020-06-05" "2020-06-06" "2020-06-07" "2020-06-08" [26] "2020-06-09" "2020-06-10" "2020-06-11" "2020-06-12" "2020-06-13"
例子
x7<-seq(as.Date("2020-05-15"),by="day",length.out=15)
x7输出结果
[1] "2020-05-15" "2020-05-16" "2020-05-17" "2020-05-18" "2020-05-19" [6] "2020-05-20" "2020-05-21" "2020-05-22" "2020-05-23" "2020-05-24" [11] "2020-05-25" "2020-05-26" "2020-05-27" "2020-05-28" "2020-05-29"
例子
x8<-seq(as.Date("2020-06-14"),by="day",length.out=31)
x8输出结果
[1] "2020-06-14" "2020-06-15" "2020-06-16" "2020-06-17" "2020-06-18" [6] "2020-06-19" "2020-06-20" "2020-06-21" "2020-06-22" "2020-06-23" [11] "2020-06-24" "2020-06-25" "2020-06-26" "2020-06-27" "2020-06-28" [16] "2020-06-29" "2020-06-30" "2020-07-01" "2020-07-02" "2020-07-03" [21] "2020-07-04" "2020-07-05" "2020-07-06" "2020-07-07" "2020-07-08" [26] "2020-07-09" "2020-07-10" "2020-07-11" "2020-07-12" "2020-07-13" [31] "2020-07-14"
例子
x9<-seq(as.Date("2020-11-01"),by="day",length.out=30)
x9输出结果
[1] "2020-11-01" "2020-11-02" "2020-11-03" "2020-11-04" "2020-11-05" [6] "2020-11-06" "2020-11-07" "2020-11-08" "2020-11-09" "2020-11-10" [11] "2020-11-11" "2020-11-12" "2020-11-13" "2020-11-14" "2020-11-15" [16] "2020-11-16" "2020-11-17" "2020-11-18" "2020-11-19" "2020-11-20" [21] "2020-11-21" "2020-11-22" "2020-11-23" "2020-11-24" "2020-11-25" [26] "2020-11-26" "2020-11-27" "2020-11-28" "2020-11-29" "2020-11-30"
例子
x10<-seq(as.Date("2020-12-01"),by="day",length.out=62)
x10输出结果
[1] "2020-12-01" "2020-12-02" "2020-12-03" "2020-12-04" "2020-12-05" [6] "2020-12-06" "2020-12-07" "2020-12-08" "2020-12-09" "2020-12-10" [11] "2020-12-11" "2020-12-12" "2020-12-13" "2020-12-14" "2020-12-15" [16] "2020-12-16" "2020-12-17" "2020-12-18" "2020-12-19" "2020-12-20" [21] "2020-12-21" "2020-12-22" "2020-12-23" "2020-12-24" "2020-12-25" [26] "2020-12-26" "2020-12-27" "2020-12-28" "2020-12-29" "2020-12-30" [31] "2020-12-31" "2021-01-01" "2021-01-02" "2021-01-03" "2021-01-04" [36] "2021-01-05" "2021-01-06" "2021-01-07" "2021-01-08" "2021-01-09" [41] "2021-01-10" "2021-01-11" "2021-01-12" "2021-01-13" "2021-01-14" [46] "2021-01-15" "2021-01-16" "2021-01-17" "2021-01-18" "2021-01-19" [51] "2021-01-20" "2021-01-21" "2021-01-22" "2021-01-23" "2021-01-24" [56] "2021-01-25" "2021-01-26" "2021-01-27" "2021-01-28" "2021-01-29" [61] "2021-01-30" "2021-01-31"