geom_point包含许多数据点，图的文件大小太大. [英] geom_point with many data points, the file size of the plot is too big.

问题描述

我有一个散点图，其中包含许多数据点.一旦我尝试放大或将其保存为pdf格式，打开它会花费很长时间，并且pdf太大.如何通过保持图的相同外观来减小文件大小或使图更浅.这是一个示例:

I have a scatter plot with many data points in it. Once I try to zoom in or save it in a pdf format, it takes a long time to open and the pdf is too large. How can I reduce the file size or make the plot lighter by keeping the same visuality of the plot. Here is an example:

library(ggplot2)
df <- data.frame(x = rnorm(50000),y=rnorm(50000))
ggplot(df,aes(x=x,y=y)) + geom_point()

推荐答案

不确定可见性是什么意思.但是接下来呢?

Not sure what you mean with visibility. But what about the following?

library(ggplot2)
df <- data.frame(x = rnorm(50000),y=rnorm(50000))
ggplot(df,aes(x=x,y=y)) + geom_point()
ggsave('C:/yourpath/test.png', dpi = 600)

这将导致大约85 kb的.png文件.

This should result in a .png file of roughly 85 kb.

如果要提高图片质量，可以将dpi增加到1200或更高.

If you want to increase the quality of the picture, you can increase dpi into 1200 or higher.

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