反转默认比例梯度ggplot2 [英] Reversing default scale gradient ggplot2

问题描述

我是新手，我正在尝试设计热图.这是我的代码:

  ggplot(gd，aes(Qcountry，Q6_1_Q6d)，order = TRUE)+geom_tile(aes(fill = prob)，color ="white")+theme_minimal()+实验室(y =造成流动性的主要原因"，x =国家/地区")+主题(axis.text.x = element_text(角度= 90，对齐= 1，对齐= 0.3))+scale_fill_gradient(name =(％)") 

哪张图可以生成完美的图表，但我的问题是低水平是深蓝色，而较高的值是浅蓝色，这是不直观的.最常见的方法是使用 rev().但就我而言，我不知道该怎么做.因此，是否可以反转此默认比例?

我个人认为，这不像默认设置那样直观.

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或者，您可以使用反向比例尺，但是这也会使图例翻转至顶部:

  ggplot(忠实，aes(等待，爆发))+geom_raster(aes(填充=密度))+scale_fill_continuous(trans ='reverse') 

I am newbie, I am trying to desing a heat map. This is my code:

ggplot(gd, aes(Qcountry, Q6_1_Q6d), order = TRUE) +
  geom_tile(aes(fill = prob), colour = "white") +
  theme_minimal() +
  labs( y = "Main reason for mobility", x = "Country") +
  theme(axis.text.x = element_text(angle = 90, hjust = 1, vjust = 0.3)) +
  scale_fill_gradient(name = "(%)")

Which produces a perfect chart, my problem is low levels are dark blue, and higher values are light blue, which is not intuitive. Most common way to do is use rev(). But in my case I dont know how to. So, is it possible to reverse this default scale? This is the legend

Other question, is there a way to create a scale gradient only with one colour. I mean, scale_fill_gradient/scale_fill_gradientn need to set a low color and high color (low = "", high = "") and I want to change the blue by red.

Thanks so much for your support.

解决方案

?scale_colour_gradient shows the default values of low = "#132B43" and high = "#56B1F7".

Simply switch those around:

ggplot(faithfuld, aes(waiting, eruptions)) +
    geom_raster(aes(fill = density)) +
    scale_fill_continuous(high = "#132B43", low = "#56B1F7")

Personally, I think this is less intuitive than the default.

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Alternatively, you can use a reverse scale, but this will also flip the legend to start at the top:

ggplot(faithfuld, aes(waiting, eruptions)) +
    geom_raster(aes(fill = density)) +
    scale_fill_continuous(trans = 'reverse')

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