Error: Discrete value supplied to continuous scale problem-CodePudding

I have a dataset, from which I am trying to create a graph that plots the development of four variables over five years. The year variable is character, but the other ones are numeric. When I try to plot the a ggplot, I get the error message:

Error: Discrete value supplied to continuous scale

Code for creating the ggplot:

ggp <- ggplot(yearlywindhcgasbio, aes(year)) geom_line(aes(y = Wind, (size = 1.5)), group = 1) geom_line(aes(y = Hard_coal), group = 2) geom_line(aes(y = Gas), group = 3) geom_line(aes(y = Bio), group = 4)

Data:

   year     Wind Hard_coal      Gas      Bio
1: 2015 236.2378  591.1061 596.0468 883.9906
2: 2016 325.8156  811.5624 454.8719 841.1440
3: 2018 615.1742  681.8199 570.9216 731.3470
4: 2019 647.8811  532.7532 512.6783 678.8823
5: 2020 821.2766  344.1962 472.8535 680.0227

How can I fix this?

CodePudding user response：

Since your year column is of class character, ggplot is giving out the error

Error: Discrete value supplied to continuous scale

You need to add the following line to make it work.

scale_x_discrete()

Your code will look like this:

ggp <- ggplot(yearlywindhcgasbio, aes(year))   
  geom_line(aes(y = Wind, (size = 1.5)), group = 1)   
  geom_line(aes(y = Hard_coal), group = 2)   
  geom_line(aes(y = Gas), group = 3)   
  geom_line(aes(y = Bio), group = 4)  
  scale_x_discrete()