如何处理“不同等级的数据”来自ggplot2的错误? [英] How to deal with "data of class uneval" error from ggplot2?
问题描述
错误:ggplot2 doesn'正在尝试将新行覆盖到现有的ggplot上时出现以下错误:我知道如何处理不同类的数据
我的代码的第一部分工作正常。以下是来自美国中西部电力市场的近期每小时风力发电数据。
现在我想在Red中叠加最近两天的观察值。它应该很容易,但我无法弄清楚为什么我得到一个错误。
任何援助将不胜感激。
以下是一个可重复使用的例子:
#阅读Wind数据
fname< - https:/ /www.midwestiso.org/Library/Repository/Market%20Reports/20130510_hwd_HIST.csv
df< - read.csv(fname,header = TRUE,sep =,,skip = 7)
df < - df [1:(长度(df $ MKTHOUR)-5),]
#格式变量
df $ MWh < - as.numeric(df $ MWh)
df $ Datetime< - strptime(df $ MKTHOUR,%m /%d /%y%I:%M%p)
#创建一些变量
df $ Date< - as.Date(df $ Datetime)
df $ HrEnd< - df $ Datetime $ hour + 1
#子集最近和最后数据
最后.obs < - 范围(df $ Date)[2]
df.recent < - 子集(df,Date%in%seq(last.obs-30,last.obs-2,by = 1) )
df.last< - subset(df,Date%in%seq(last.obs-2,last.obs,by = 1))
# b $ bp < - ggplot(df.recent,aes(HrEnd,MWh,g roup = factor(Date)))+
geom_line(color =gray)+
scale_y_continuous(labels = comma)+
scale_x_continuous(breaks = seq(1,24,1)) +
实验室(y =MWh)+
实验室(x =小时终点)+
实验室(title =每小时风力发电)
p
#最后两天在红色
p < - p + geom_line(df.last,aes(HrEnd,MWh,group = factor(Date)),color =red)
p
当您向geom添加新数据集时需要使用 data =
参数。或者按照正确的顺序 mapping = ...,data = ...
来输入参数。看看?geom_line
的参数。
因此:
p + geom_line(data = df.last,aes(HrEnd,MWh,group = factor(Date)),color =red)
或者:
p + geom_line(aes(HrEnd,MWh,group = factor(Date)),df.last,color =red)
While trying to overlay a new line to a existing ggplot I am getting the following error:
Error: ggplot2 doesn't know how to deal with data of class uneval
The first part of my code works fine. Below is a image of "recent" hourly wind generation data from a Midwestern United States electric power market.
Now I want to overlay the last two days worth of observations in Red. It should be easy but I cant figure out why I am getting a error.
Any assistance would be greatly appreciated.
Below is a reproducable example:
# Read in Wind data
fname <- "https://www.midwestiso.org/Library/Repository/Market%20Reports/20130510_hwd_HIST.csv"
df <- read.csv(fname, header=TRUE, sep="," , skip=7)
df <- df[1:(length(df$MKTHOUR)-5),]
# format variables
df$MWh <- as.numeric(df$MWh)
df$Datetime <- strptime(df$MKTHOUR, "%m/%d/%y %I:%M %p")
# Create some variables
df$Date <- as.Date(df$Datetime)
df$HrEnd <- df$Datetime$hour+1
# Subset recent and last data
last.obs <- range(df$Date)[2]
df.recent <- subset(df, Date %in% seq(last.obs-30, last.obs-2, by=1))
df.last <- subset(df, Date %in% seq(last.obs-2, last.obs, by=1))
# plot recent in Grey
p <- ggplot(df.recent, aes(HrEnd, MWh, group=factor(Date))) +
geom_line(color="grey") +
scale_y_continuous(labels = comma) +
scale_x_continuous(breaks = seq(1,24,1)) +
labs(y="MWh") +
labs(x="Hour Ending") +
labs(title="Hourly Wind Generation")
p
# plot last two days in Red
p <- p + geom_line(df.last, aes(HrEnd, MWh, group=factor(Date)), color="red")
p
when you add a new data set to a geom you need to use the data=
argument. Or put the arguments in the proper order mapping=..., data=...
. Take a look at the arguments for ?geom_line
.
Thus:
p + geom_line(data=df.last, aes(HrEnd, MWh, group=factor(Date)), color="red")
Or:
p + geom_line(aes(HrEnd, MWh, group=factor(Date)), df.last, color="red")
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