按 r 中的类型为散点图着色 [英] Colouring scatter graph by type in r

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问题描述

有没有办法在 R 中创建散点图并按类别为点着色?例如,我有一个包含 x 和 y 点列表的数据集(Xpoints"和Ypoints"列的比例从 0 到 100),但每个组合的 x&y 点属于五个类别之一(在第三个列类别").我想绘制所有组合的 x&y 点并按其各自的类别为每个点着色.我猜这五个类别必须在附加列中分配数字 1 到 5.但是绘制这个的代码是什么?

Is there a way you can create a scatter graph in R and colour the points by a category? For example, I have a dataset with a list of x and y points (both columns 'Xpoints' and 'Ypoints' have scales from 0 to 100), but each combined x&y point belongs to one of five categories (in a third column 'Category'). I would like to plot all the combined x&y points AND colour each point by its respective category. I'm guessing that the five categories would have to allocated numbers 1 to 5 in an additional column. But what would be the code to plot this?

推荐答案

使用广泛用于此类应用程序的 ggplot2 包.

Use the ggplot2 package which is widely used for applications such as these.

# toy data
my_data <- data.frame(x = sample(1:100, replace = T, 100),
                      y = sample(1:100, replace = T, 100),
                      cat = sample(c('first', 'second', 'third'), replace = T, 100)
                      )

# required packages
require(ggplot2)

# make the graph
ggplot(data = my_data, aes(x = x, y = y, color = cat)) +
        geom_point()

ggsave(height = 4, width = 4, filename = 'SO36801313.png')

上面的代码提供了下图.

The code above provides the following graph.

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