R:heatmap.2更改颜色键 [英] R: heatmap.2 change color key

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问题描述

我有关于 gplots 的问题。我想使用函数 heatmap.2 ,因此我想将颜色键中的对称点从0更改为1.通常当 symkey = TRUE ,并使用 col = redgreen()创建一个彩色条,其中的颜色管理如下:

  red = -2至-0.5 
black = -0.5至0.5
green = 0.5至2



现在我要创建一个这样的颜色条:

 code> red = -1至0.8 
black = 0.8至1.2
green = 1.2至3

这样的东西可能吗?



谢谢!

解决方案

如果您看一下 heatmap.2帮助文件,它看起来像你想要的断言参数。从帮助文件中:


break 用于将x分组为颜色的分裂点或者要使用的整数个断点,在这种情况下,断点将在min(x)和max(x)之间等间隔




因此,您可以使用 break 指定每种颜色的截止点。例如:

 库(gplots)

#构成一堆从-1开始的随机数据, (样本(seq(-1,3,by = .1),100,replace = TRUE),...,9, ncol = 10)

#plot。我们想要-1到0.8是红色,0.8到1.2是黑色,1.2到3是绿色。
heatmap.2(x,col = redgreen,breaks = c(-1,0.8,1.2,3))

关键的是 breaks = c(-1,0.8,1.2,3)是你的临界值。


I have a question about the package gplots. I want to use the function heatmap.2 and therefore I want to change my symmetric point in color key from 0 to 1. Normally when symkey=TRUE and you use the col=redgreen(), a colorbar is created where the colors are managed like this:

red = -2 to -0.5
black=-0.5 to 0.5
green= 0.5 to 2

Now i want to create a colorbar like this:

red= -1 to 0.8
black= 0.8 to 1.2
green= 1.2 to 3

Is something like this possible?

Thank you!

解决方案

If you look at the heatmap.2 help file, it looks like you want the breaks argument. From the help file:

breaks (optional) Either a numeric vector indicating the splitting points for binning x into colors, or a integer number of break points to be used, in which case the break points will be spaced equally between min(x) and max(x)

So, you use breaks to specify the cutoff points for each colour. e.g.:

library(gplots)

# make up a bunch of random data from -1, -.9, -.8, ..., 2.9, 3
# 10x10
x = matrix(sample(seq(-1,3,by=.1),100,replace=TRUE),ncol=10)

# plot. We want -1 to 0.8 being red, 0.8 to 1.2 being black, 1.2 to 3 being green.
heatmap.2(x, col=redgreen, breaks=c(-1,0.8,1.2,3))

The crucial bit is the breaks=c(-1,0.8,1.2,3) being your cutoffs.

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