问题描述
使用R中的ggplot2库绘制图形时遇到问题.我有一个'Date'变量，其中包含3个'Brand'品牌中每个品牌的披露值'Rating'的日期.问题是，事件发生后，市场仅由两个品牌共享.因此，我想在此事件之前和之后分别绘制线条，尽管在同一图中.是否可以?如果我使用平滑函数按原样绘制所有图表，那么图表将毫无意义，因此我必须在两个阶段之间保持迄今为止的状态，这两个阶段的日期在"16/09/2012"和"18/09/2012"之间或介于第五和第六个元素之间.
I've a problem plotting a graph using ggplot2 library in R.I have a 'Date' variable containing date of disclosed values 'Rating' for each of the 3 'Brand' brands. The thing is that after an event, the market is only shared by two brands. So, I want to plot lines for before and after this event separately although in the same plot. Is it possible? If I plot everything as is with a smoothing function, the chart gets no sense, so I must leave an hitherto between the two phases, which in the date below is between "16/09/2012" and "18/09/2012" or between the fifth and sixth elements.
x <- c("1jan1960", "2jan1960", "31mar1960", "30jul1960")
as.Date(x, "%d%b%Y")
x <- c("10/09/2012", "12/09/2012", "11/09/2012")
as.Date(x, "%d/%m/%Y")
x <- c("12/09/2012", "13/09/2012", "14/09/2012", "15/09/2012","16/09/2012","18/09/2012","19/09/2012","20/09/2012","22/09/2012","23/09/2012")
x <- as.Date(x, "%d/%m/%Y")
y <-c(30,32,33,34,35,45,46,44,46,47)
y2<-c(20,22,23,27,29,55,54,56,54,53)
y3 <- c(10,10,10,7,6,NA,NA,NA,NA,NA)
data1 <- data.frame(x,y1)
data1$w <-"A"
data2 <- data.frame(x,y2)
data2$w <-"B"
data3 <- data.frame(x,y3)
data3$w <-"C"
colnames(data1)<- c("Date", "Rating", "Brand")
colnames(data2)<- c("Date", "Rating", "Brand")
colnames(data3)<- c("Date", "Rating", "Brand")
data <-rbind(data1,data2,data3)
#Chart
(plot <-ggplot(data, aes(x=Date,
y=Rating, colour=Brand, group=Brand))
+ geom_line(size=.5)
+ geom_smooth(aes(x=Date, y=Rating),
method="loess", size=3, se=F) )
推荐答案
像这样吗?
data$Event <- "Before"
data[data$Date>="2012-09-18",]$Event <- "After"
data$Event <- factor(data$Event, levels=c("Before","After"))
#Chart
ggplot(data,aes(x=Date, y=Rating, colour=Brand, group=Brand))+
geom_line(size=.5) +
geom_smooth(aes(x=Date, y=Rating), method="loess", size=1, se=F)+
facet_wrap(~Event, scales="free_x")
这将添加新列 data $ Event ，该列在事件之前具有值"Before"，在事件之后具有"After".然后，我们使用ggplot中的构面将之前"和之后"分开.
This adds a new column, data$Event which takes on values "Before" before the event and "After" after the event. Then we use facets in ggplot to separate Before and After.
原因:
data$Event <- factor(data$Event, levels=c("Before","After"))
是要创建有序因子:ggplot希望按字母顺序(从之后"到之前")绘制构面，除非我们这样做.
is to create an ordered factor: ggplot wants to plot the facets in alphabetical order (After, then Before), unless we do this.
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