I have a dataframe (df_new) that looks something like this:
date<- c("2020-01-01", "2020-01-02", "2020-01-03", "2020-01-04", "2020-01-05")
A <- c(23, 41, 32, 58, 26)
B <- c(10, 20, 30, 40, 50)
df_new <- data.frame(date, A, B)
df_new$date <- as.Date(df_new$date)
I am using the following code to plot values A and B.
ggplot(data = df_new, aes(x = date)) +
geom_line(aes(y = A, colour = "Value A")) +
geom_line(aes(y = B, colour = "Value B"))+
labs(title = 'A & B Distribution',
x = '',
y = 'Value Count',
color = " ") +
theme_bw() +
scale_y_log10(breaks = trans_breaks("log10", function(x) 10^x),
labels = trans_format("log10", math_format(10^.x)))+
geom_vline(xintercept = as.numeric(as.Date("2020-01-03")), linetype=4)+
theme(text=element_text(size=13),panel.spacing.x=unit(0.6, "lines"),
panel.spacing.y=unit(1, "lines"))
It is giving me the plot as desired except that I would like to add a legend of geom_vline under Value B where I have manually drawn a black line.
Any guidance please?
You can manually set a legend with color using scale_color_manual
. You name the color
of vline
black which you can assign as a value in the legend by "black"="black"
. This can be manually changed to whatever you want. You can use the following code:
library(tidyverse)
library(scales)
ggplot(data = df_new, aes(x = date)) +
geom_line(aes(y = A, colour = "Value A")) +
geom_line(aes(y = B, colour = "Value B"))+
labs(title = 'A & B Distribution',
x = '',
y = 'Value Count',
color = " ") +
theme_bw() +
scale_y_log10(breaks = trans_breaks("log10", function(x) 10^x),
labels = trans_format("log10", math_format(10^.x)))+
geom_vline(xintercept = as.numeric(as.Date("2020-01-03")), linetype=4, color = "black")+
theme(text=element_text(size=13),panel.spacing.x=unit(0.6, "lines"),
panel.spacing.y=unit(1, "lines")) +
scale_color_manual(name = "Legend", values = c("Value A" = "red", "Value B" = "blue", "black" = "black"))
Output: