###### 胖鸭
2010-08-31 07:03 阅读 95

# 如何在 ggplot2 r 图中设置轴的限制？

I plot the following:

``````library(ggplot2)

carrots <- data.frame(length = rnorm(500000, 10000, 10000))
cukes <- data.frame(length = rnorm(50000, 10000, 20000))
carrots\$veg <- 'carrot'
cukes\$veg <- 'cuke'
vegLengths <- rbind(carrots, cukes)

ggplot(vegLengths, aes(length, fill = veg)) +
geom_density(alpha = 0.2)
``````

Now say I only want to plot the region between `x=-5000` to `5000`, instead of the entire range.

How can I do that?

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#### 2条回答默认 最新

• 已采纳
游.程 2010-08-31 07:15

Basically you have two options

``````scale_x_continuous(limits = c(-5000, 5000))
``````

or

``````coord_cartesian(xlim = c(-5000, 5000))
``````

Where the first removes all data points outside the given range and the second only adjusts the visible area. In most cases you would not see the difference, but if you fit anything to the data it would probably change the fitted values.

You can also use the shorthand function `xlim` (or `ylim`), which like the first option removes data points outside of the given range:

``````+ xlim(-5000, 5000)
``````

For more information check the description of `coord_cartesian`.

The RStudio cheatsheet for `ggplot2` makes this quite clear visually. Here is a small section of that cheatsheet:

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• bug^君 2016-09-02 18:43

Quick note: if you're also using `coord_flip()` to flip the x and the y axis, you won't be able to set range limits using `coord_cartesian()` because those two functions are exclusive (see here).

Fortunately, this is an easy fix; set your limits within `coord_flip()` like so:

``````p + coord_flip(ylim = c(3,5), xlim = c(100, 400))
``````

This just alters the visible range (i.e. doesn't remove data points).

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