使用lubridate和ggplot2有效地处理日期轴 [英] Using lubridate and ggplot2 effectively for date axis
问题描述
library(ggplot2)
library(lubridate)
set.seed(4)
date < - seq(from = as.POSIXct(2012-01-01),to = as.POSIXct(2014-12-31),by = (rnorm(274,50,1),rnorm(274,55,1),rnorm(274,55,2),rnorm(274,60,2))
值< b $ b df< - data.frame(日期,值)
头(df)
#日期值
#1 2012-01-01 50.21675
#2 2012-01-02 49.45751
#3 2012-01-03 50.89114
#4 2012-01-04 50.59598
#5 2012-01-05 51.63562
#6 2012-01-06 50.68928
ggplot(df,aes(x = yday(date),y = value,color = factor(year(date))))+
geom_line()
产生这种情节:
< img src =https://i.stack.imgur.com/j2rrU.pngalt =情节>
有什么方法可以让轴格式化作为逐月的日期?如果可能,我试图确定一个干净的方式来利用 lubridate
和 scale_x_date
?
也许有更好的方法来创建这种类型的图表?也就是说,按年份创造因素并将它们打在一起? (注意:本例中我不想使用 facet_wrap
或 facet_grid
)。
一个解决方案可能是将一列添加到您的数据框中,该列将包含一天中的每一行和另一年中的月份(对于所有行都是相同的) ,例如2015年。
df $天< -as.Date(格式(df $ date,%d-% m-2015),format =%d-%m-%y)
您可以然后使用此列作为 x
库(比例)
ggplot(df,aes(x = days,y = value,color = factor(year(date))))+
geom_line()+ scale_x_date(labels = date_format(%b))
编辑:简化 df $天
行
Consider this example:
library(ggplot2)
library(lubridate)
set.seed(4)
date <- seq(from = as.POSIXct("2012-01-01"), to = as.POSIXct("2014-12-31"), by = "days")
value <- c(rnorm(274, 50, 1), rnorm(274, 55, 1), rnorm(274, 55, 2), rnorm(274, 60, 2))
df <- data.frame(date, value)
head(df)
# date value
# 1 2012-01-01 50.21675
# 2 2012-01-02 49.45751
# 3 2012-01-03 50.89114
# 4 2012-01-04 50.59598
# 5 2012-01-05 51.63562
# 6 2012-01-06 50.68928
ggplot(df, aes(x=yday(date), y=value, color=factor(year(date)))) +
geom_line()
Which generates this plot:
What are some ways to make the axis formatted as a date by month? I am trying to determine a clean way to leverage both lubridate
and scale_x_date
if possible?
Perhaps there are better ways to create this type of graph? That is, creating factors by year and plotting them on top of each other? (NOTE: I do not want to use facet_wrap
or facet_grid
for this example).
One solution could be to add a column to your dataframe that will contain for each row the day and the month in another year (the same for all rows), for example year 2015.
df$days<-as.Date(format(df$date,"%d-%m-2015"),format="%d-%m-%y")
You can then plot using this column as x
library(scales)
ggplot(df, aes(x=days, y=value, color=factor(year(date)))) +
geom_line()+scale_x_date(labels = date_format("%b"))
Edit: simplified the df$days
line
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