Can't get R to do a line between years-CodePudding

I have created a data set and I am having some issues with graphing it. I think it stems from the fact that the data set is quite small so R doesn't recognise my X axis as years but rather as continuous data. Therefore, my graph has 2020.5. So, I have to convert the years column using as.factor(AshQuads$Year) but then it refuses to connect the years with geom_line.

This is the code I have been using

ggplot(Ash_Quads, aes(x=Year, y=Quadrats, colour=factor(Ash))) 
  geom_point() 
  theme_bw()

and this is my data frame:

I was wondering if anyone can help please?

CodePudding user response：

I would suggest just leaving the x-axis as continuous, rather than converting it to a factor. Simply provide the actual breaks you want for your x-axis, in this case, the years 2020:2022

ggplot(df, aes(Year,Quadrats,color=Ash))   
  geom_point()   geom_line()   
  scale_x_continuous(breaks=2020:2022)
  theme_bw()

CodePudding user response：

One option is to set the Year to factor (as you mention), then add the group into aes (i.e., group = Ash). You also need to add geom_line, which you don't have in your code.

library(tidyverse)

ggplot(Ash_Quads, aes(x = factor(Year), y = Quadrats, colour = factor(Ash), group = Ash))  
  geom_point()  
  geom_line()  
  theme_bw()

Or you can use scale_x_continuous to set the x-axis (so leave as continuous data and not convert Year to factor):

ggplot(Ash_Quads, aes(x = Year, y = Quadrats, colour = factor(Ash)))  
  geom_point()  
  geom_line()  
  scale_x_continuous(breaks = 2020:2022)  
  theme_bw()

Data

Ash_Quads <- structure(list(Year = c(2020, 2021, 2022, 2020, 2021, 2022), 
    Quadrats = c(37, 31, 13, 54, 56, 38), Ash = c("No Ash", "No Ash", 
    "No Ash", "Ash", "Ash", "Ash")), class = "data.frame", row.names = c(NA, 
-6L))