ggplot手动设置scale_color_gradientn

问题描述

我有这样的数据框

  BP R2 LOG10 
 96162057 0.2118000 2.66514431 
 96162096 0.0124700 0.31749391 
 96162281 0.000 b $ b 96162281 0.0008941 0.07012148 
 96163560 0.5011000 2.48505399 
 96163638 0.8702000 3.37778598 
  

并且我想绘制BP对照LOG10，并且颜色的点由R2。 R2是0-1的连续值。

  myplot<  -  read.cvs（mytable.csv，head = TRUE）
 attach（myplot） 
 ggplot（myplot，aes（BP，LOG10，color = R2））+ geom_point（）
  

到目前为止，这么好。但是，我想以手动选择的间隔和颜色显示R2颜色，像这样（如果我有离散值）。

  ggplot（myplot，aes（BP，LOG10，color = R2））+ geom_point（）+ 
 scale_color_manual（breaks = c（1，0.8，0.6，0.4，0.2 0），
 values = c（red，yellow，green，lightblue，darkblue））
错误：连续值提供给离散比例
  

这看起来很漂亮，但我宁愿设置我自己的颜色。

  ggplot（myplot，aes（BP，LOG10，color = R2））+ geom_point（shape = 1）+ 
 scale_colour_gradientn因此，我如何从连续值（1-0.8,0.8-0.6,0.6-0.6）手动选择间隔， 0.4，0.4-0.2，0.2-0），并按他们喜欢的颜色（红，黄，绿，光，暗蓝）？颜色之间的平滑渐变会很酷，但不是至关重要。 
解决方案
您可以使用 scale_colour_gradientn（） code> colors = 和 values = 。值将为每种颜色提供间隔。
  ggplot（myplot，aes（BP，LOG10，color = R2））+ geom_point ）+ 
 scale_colour_gradientn（colors = c（red，yellow，green，lightblue，darkblue），
 values = c（1.0,0.8,0.6,0.4,0.2 ，0））
  
 
I have a data frame like this
BP        R2      LOG10
96162057 0.2118000 2.66514431
96162096 0.0124700 0.31749391
96162281 0.0008941 0.07012148
96163560 0.5011000 2.48505399
96163638 0.8702000 3.37778598
and I want to plot BP against LOG10, and color the points by R2. R2 are continuous values from 0-1. 
myplot <- read.cvs("mytable.csv",head=TRUE)
attach(myplot)
ggplot(myplot,aes(BP,LOG10, color=R2)) + geom_point()
So far, so good. However I would like to display the R2 colors in manually selected intervals and colors, like this (if I had discrete values).
ggplot(myplot,aes(BP,LOG10, color=R2)) + geom_point() +
      scale_color_manual(breaks= c("1","0.8","0.6","0.4","0.2","0"),
                values = c("red","yellow","green","lightblue","darkblue"))
Error: Continuous value supplied to discrete scale
This looks pretty, but I would rather set the colors my self.
ggplot(myplot,aes(BP,LOG10, color=R2)) + geom_point(shape=1) +
               scale_colour_gradientn(colours = rainbow(10))
So, how can I manually select intervals from continuous values (1-0.8, 0.8-0.6, 0.6-0.4, 0.4-0.2, 0.2-0), and color them to my liking (red, yellow, green, light, darkblue)? A smooth gradient between the colors would be cool, but not crucial. 
 解决方案 
You can use scale_colour_gradientn() and then provide your own colours= and values=. Values will give intervals for each color.
ggplot(myplot,aes(BP,LOG10, color=R2)) + geom_point() +
  scale_colour_gradientn(colours = c("red","yellow","green","lightblue","darkblue"),
                         values=c(1.0,0.8,0.6,0.4,0.2,0))
                        
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