在R中使用geom_rect进行时间系列着色 [英] Using geom_rect for time series shading in R
问题描述
我试图遮蔽时间序列图的某一部分(有点像衰退阴影 - 类似于这篇关于excel中衰退阴影的文章)。我已经把一些可能很笨拙的样本放在一起来说明。
我首先创建一个时间序列,使用ggplot2绘制它,然后想要使用geom_rect来提供阴影。但是我必须在参数中出错。
a< -rnorm(300)
_ts <-ts( a,start = c(1910,1),frequency = 12)
a_time< -time(a_ts)
a_series< -ts.union(big = a_ts,month = a_time)
a_series_df< ; -as.data.frame(a_series)
ggplot(a_series)+
geom_line(mapping = aes_string(x =month,y =big))+
geom_rect(
fill =red,alpha = 0.5,
mapping = aes_string(x =month,y =big),
xmin = as.numeric(as.Date(c 1924-01-01))),
xmax = as.numeric(as.Date(c(1928-12-31))),
ymin = 0,
ymax = 2
)
请注意,我也尝试过哪些方法也无效。 / b>
geom_rect(
fill =red,alpha = 0.5,
mapping = aes_string(x =月,y =大),
aes(
xmin = as.numeric(as.Date(c(1924-01-01))),
xmax = as .numeric(as.Date(c(1928-12-31))),
ymin = 0,
ymax = 2)
)
见下文,需要润滑包装。
$ b $ pre $ require(lubridate)
ggplot(a_series_df)+
geom_line(mapping = aes_string(x =month,y =big))+
geom_rect(
fill =red,alpha = 0.5,
mapping = aes_string(x =month,y =大),
xmin = decimal_date(as.Date(c(1924-01-01))),
xmax = decimal_date(as.Date(c(1928-12-31 ))),
ymin = 0,
ymax = 2
)
ggplot()+
更清晰的版本,阴影首先被绘制出来,所以线条颜色不会改变。 geom_rect(data = data.frame(xmin = decimal_date(as.Date(c(1924-01-01))),
xmax = decimal_date(as.Date(c(1928-12-31 ))),
ymin = -Inf,
ymax = Inf),
aes(xmin = xmin,xmax = xmax,ymin = ymin,ymax = ymax),
fill =gray,alpha = 0.5)+
geom_line(data = a_series_df,aes(month,big),color =blue)+
theme_classic()
I am trying to shade a certain section of a time series plot (a bit like recession shading - similarly to the graph at the bottom of this article on recession shading in excel). I have put a little, possibly clumsy, sample together to illustrate. I first create a time series, plot it with ggplot2 and then want to use geom_rect to provide the shading. But I must get something wrong in the arguments.
a<-rnorm(300)
a_ts<-ts(a, start=c(1910, 1), frequency=12)
a_time<-time(a_ts)
a_series<-ts.union(big=a_ts, month=a_time)
a_series_df<-as.data.frame(a_series)
ggplot(a_series)+
geom_line(mapping=aes_string(x="month", y="big"))+
geom_rect(
fill="red",alpha=0.5,
mapping=aes_string(x="month", y="big"),
xmin=as.numeric(as.Date(c("1924-01-01"))),
xmax=as.numeric(as.Date(c("1928-12-31"))),
ymin=0,
ymax=2
)
Note that I have also tried which also did not work.
geom_rect(
fill="red",alpha=0.5,
mapping=aes_string(x="month", y="big"),
aes(
xmin=as.numeric(as.Date(c("1924-01-01"))),
xmax=as.numeric(as.Date(c("1928-12-31"))),
ymin=0,
ymax=2)
)
Code works fine, conversion to decimal date is needed for xmin and xmax, see below, requires lubridate package.
require("lubridate")
ggplot(a_series_df)+
geom_line(mapping=aes_string(x="month", y="big"))+
geom_rect(
fill="red",alpha=0.5,
mapping=aes_string(x="month", y="big"),
xmin=decimal_date(as.Date(c("1924-01-01"))),
xmax=decimal_date(as.Date(c("1928-12-31"))),
ymin=0,
ymax=2
)
Cleaner version, shading plotted first so the line colour doesn't change.
ggplot() +
geom_rect(data=data.frame(xmin=decimal_date(as.Date(c("1924-01-01"))),
xmax=decimal_date(as.Date(c("1928-12-31"))),
ymin=-Inf,
ymax=Inf),
aes(xmin=xmin,xmax=xmax,ymin=ymin,ymax=ymax),
fill="grey",alpha=0.5) +
geom_line(data=a_series_df,aes(month,big),color="blue") +
theme_classic()
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