在R语言中使用ggplot2时如何使y轴值按顺序排列

Question

I was trying to use ggplot2 to plot multiple lines in a window. this is my code here:

ggplot(type1_age, aes(x = Year, y = Value, group = Age, color = Age)) + geom_line()+ggtitle('The percentage distribution of type1 diabetes patients in different age groups')+ylab("percentage (%)")

type1_age file looks like this: the result figure is this:

the problem is that y-axis in the result figure is not in order. can you please help me to figure out? Thanks!

Answer 1

you should try this (with tidyverse):

type1_age %>%
mutate(Value = Value %>% as.character %>% as.numeric) %>% 
ggplot(aes(x = Year, y = Value, group = Age, color = Age)) +
geom_line()+
ggtitle('The percentage distribution of type1 diabetes patients in different age groups')+
ylab("percentage (%)")

I suspect you Value variable to be a character vector and not a numeric one. The first part of the code should transform it in one.

Tell me if it works!