基于ggplot 2中颜色和因子大小的点的散点图

I'm new to ggplot2 so please bear with me. I would like to make a scatter plot in ggplot2 where I can color the data OR change the size of the points based on a second variable factor. I am able to do this for color using the plot() function as so:

我是ggplot2的新手所以请耐心等待。我想在ggplot2中制作散点图，我可以在其中为数据着色或根据第二个变量因子更改点的大小。我可以使用plot（）函数对颜色执行此操作，如下所示：

#simulate data
x1 <- rnorm(100)
y <- as.factor(runif(100)<=.70)
df <- data.frame(x1,y)
#plot
plot(df$x1, col = df$y,cex = 1, pch = 19)

And this is my attempt with ggplot2:

这是我对ggplot2的尝试：

qplot(seq_along(df$x1), df$x1) + scale_colour_manual(breaks = df$y)

2 个解决方案

#1

You can achieve the expected output by specifying the color and shape in col and shape in aes.

您可以通过在aes中指定col和shape中的颜色和形状来实现预期输出。

library(ggplot2)
ggplot(df, aes(x=x1, y=seq(1,length(x1)),col=y, shape=y)) + geom_point()

output:

输出：

#2

Your question has a title: scatterplot with points based on color and shape of factor in ggplot 2

你的问题有一个标题：散点图，根据颜色和ggplot 2中的因子形状得分

whereas the text in the question says: ...where I can color the data OR change the size of the points...

而问题中的文字说：......我可以在哪里为数据着色或改变点的大小......

So what are you looking for? Colour, shape or size?

你在找什么？颜色，形状或大小？

You can use shape,size and colour argument in ggplot():

您可以在ggplot（）中使用形状，大小和颜色参数：

library(ggplot2)
ggplot(df, aes(x=seq(1,length(x1)), y=x1,colour=y, size=y)) + geom_point()

In this example i just set up that the size (size=...) and colour (color=...) should depend on y variable, but you can change it however you want. For the shape argument just use shape=...

在这个例子中，我只是设置尺寸（size = ...）和颜色（color = ...）应该取决于y变量，但你可以随意改变它。对于shape参数，只需使用shape = ...

However: Using size for a discrete variable is not advised.

但是：不建议使用大小作为离散变量。

#1