CODEWITHSUNDEEP
rggplot2
Bella
Bella

Reputation: 1017

How to rename the y axis ticks in ggplot r

I have created a tile plot, as below: enter image description here

I'd like to rename the y axis ticks, instead of 1 - to "country", 2- to "city", 3 - to "all". I couldn't find a way to do it. I have the following script:

ggplot(test_df, aes(num, sample_type, fill = exist)) + 
geom_tile(width=0.9, height=0.9,color = "gray")+ 
scale_fill_gradientn(colours = c("white", "lightgreen"), values = c(0,1))+ 
theme(axis.text.x = element_text(angle = 90, hjust = 1), 
legend.position="none")+
scale_x_discrete(position = "top") + labs(x = "", y= "Sample Type")

How can I do that without changing my dataframe?

Here is a sample of my dataframe:

test_df <- data.frame(
num = c("num1","num1","num1","num2","num2","num2","num3","num3","num3"),
sample_type = c(1,2,3,1,3,2,3,1,2),
exist = c(1,0,0,1,1,0,1,0,0))

Upvotes: 1

Views: 7623

Answers (1)

MrFlick
MrFlick

Reputation: 206167

It looks like you want to treat your Y values as discreate values, rather than numeric. The easiest way to deal with that is to make the number a factor. You can do

ggplot(test_df, aes(num, factor(sample_type), fill = exist)) + 
  geom_tile(width=0.9, height=0.9,color = "gray")+ 
  scale_fill_gradientn(colours = c("white", "lightgreen"), values = c(0,1))+ 
  theme(axis.text.x = element_text(angle = 90, hjust = 1), 
        legend.position="none")+
  scale_y_discrete(labels=c("1"="country","2"="city", "3"="all")) +
  scale_x_discrete(position = "top") + labs(x = "", y= "Sample Type")

Notice the aes(num, factor(sample_type), ...) to convert sample_type to a factor and then the scale_y_discrete to control the labels for those levels.

Upvotes: 5

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