I have done an application RShiny with a plot using ggplot.
Now, I want to add an average line to the existing plot.
library(ggplot2)
A <- c(1:10)
B <- c(1,1,2,2,3,3,4,4,5,5)
donnees <- data.frame(A,B)
datetime<-donnees[,2]
Indcatotvalue<-donnees[,1]
df<-donnees
mn<-tapply(donnees[,1],donnees[,2],mean)
moyenne <- data.frame(template=names(mn),mean=mn)
ggplot(data=df,
aes_q(x=datetime,
y=Indcatotvalue)) + geom_line()
I have tried to add :
geom_line(aes(y = moyenne[,2], colour = "blue"))
or :
lines(moyenne[,1],moyenne[,2],col="blue")
but nothing happens :( I don't understand especially for the function "lines".
Thank you for your answer...
When you say average line I'm assuming you want to plot a line that represents the average value of Y (Indcatotvalue
). For that you want to use geom_hline()
which plots horizontal lines on your graph:
ggplot(data=df,aes_q(x=datetime,y=Indcatotvalue)) +
geom_line() +
geom_hline(yintercept = mean(Indcatotvalue), color="blue")
Which, with the example numbers you gave, will give you a plot that looks like this: