从日期序列中删除leap日

问题描述

我正在尝试从日期序列中删除leap日，但是，我遇到了错误.请帮忙.

I am trying to remove leap day from my date sequence, however, I am getting error. Please help.

Dates=as.data.frame(seq(as.Date("1979-01-01"), to=as.Date("2016-12-31"),by="days"))
names(Dates)= "Dates"
Dates$year=as.numeric(format(Dates$Dates, "%Y"))
Dates$month=as.numeric(format(Dates$Dates, "%m"))
Dates$day=as.numeric(format(Dates$Dates, "%d"))

if [(Dates$month == 2 & Dates$day == 29)]
    Dates=Dates[]

没有leap日的日期序列

Date sequence with no leap day

推荐答案

使用各种软件包，您将在这里得到很多答案，但是您可以使用base R和 format()>功能.您提取月份和日期，然后使用否定来排除leap日:

You'll get plenty of answers here with a variety of packages, but you can do this with base R and the format() function. You extract the month and day and then use negation to exclude the leap dates:

myDates <- myDates[!(format(myDates$Dates,"%m") == "02" & format(myDates$Dates, "%d") == "29"), , drop = FALSE]

format()返回字符，因此我们需要在引号中加上"02" 和"29" .

format() returns characters, so thus we need to put "02" and "29" in quotes.

在评论中解决问题

上面的代码完全符合您的要求:

The code above does precisely what you are asking:

myDates=data.frame(seq(as.Date("1979-01-01"), to=as.Date("2016-12-31"),by="days"))
names(myDates)= "Dates"
nrow(myDates)
#> [1] 13880
myDates <- myDates[!(format(myDates$Dates,"%m") == "02" & format(myDates$Dates, "%d") == "29"), ,drop = FALSE]
nrow(myDates)
#> [1] 13870

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