散点图

Question

我想在融化的数据帧中绘制变量的分散(xy)图，如下所示。

df
class var  mean        
0      x   4.25 
0      y   6.25 
1      x   2.00 
1      y  11.00 

我试过了，但它画了4分。如何绘制x和y？

library(ggplot2)

ggplot(df, aes(x=mean, y=mean, group=var, colour=class)) +
geom_point( size=5, shape=21, fill="white")

Answer 1

正如Heroka所指出的，您需要数据采用更宽的类型格式。如果数据是这样读取的，您可以使用以下方法来转换它。

## you don't need this since you already have df
text = "class var mean
0 x 4.25
0 y 6.25
1 x 2.00
1 y 11.00"
df = read.delim(textConnection(text),header=TRUE,strip.white=TRUE,     
stringsAsFactors = FALSE, sep = " ");df2

## use this library to switch from long-wide
library(reshape2)

df2 = dcast(df, class ~ var, value.var = "mean")

library(ggplot2)
ggplot(df2, aes(x=x, y=y, colour=class)) +
  geom_point( size=5, shape=21, fill="white")

​

​