CODEWITHSUNDEEP
rggplot2
Klaus
Klaus

Reputation: 41

Can't get R to do a line between years

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: my_dataset

I was wondering if anyone can help please?

Upvotes: 0

Views: 657

Answers (2)

AndrewGB
AndrewGB

Reputation: 16856

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()

enter image description here

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))

Upvotes: 1

langtang
langtang

Reputation: 24742

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()

quadrats

Upvotes: 1

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