Error: Discrete value supplied to continuous scale

Posted 2022-03-17 Data+Science+Insight

Error: Discrete value supplied to continuous scale

目录

Error: Discrete value supplied to continuous scale

问题：

解决：

完整错误：

---

问题：

#y变量的数据类型为字符型（character）,而ggplot2可视化需要的是数值啊，，，

#create data frame
df = data.frame(x = 1:12,
                y = rep(c('1', '2', '3', '4'), times=3))

#view data frame
df

library(ggplot2)

#attempt to create scatterplot with custom y-axis scale
ggplot(df, aes(x, y)) +
  geom_point() +
  scale_y_continuous(limits = c(0, 10))

解决：

#查看数据类型

#check class of y variable
class(df$y)

[1] "character"

#as.numeric进行转化（从字符型到数值型）

library(ggplot2) 

#convert y variable to numeric
df$y <- as.numeric(df$y)

#create scatterplot with custom y-axis scale
ggplot(df, aes(x, y)) +
  geom_point() +
  scale_y_continuous(limits = c(0, 10))

完整错误：

> library(ggplot2)
> 
> #attempt to create scatterplot with custom y-axis scale
> ggplot(df, aes(x, y)) +
+     geom_point() +
+     scale_y_continuous(limits = c(0, 10))
Error: Discrete value supplied to continuous scale