从ggplot2中提取颜色信息？
使用保存在名为 foo.txt 的文件中的虚拟代码...
COG,station1,station2,station3,station4,station5
COG000Z,0.019393497,0.183122497,0.089911227,0.283250444,0.074110521
COG0002,0.044632051,0.019118032,0.034625785,0.069892277,0.034073709
COG0001,0.033066112,0,0,0,0
COG0004,0.115086472,0.098805295,0.148167492,0.040019101,0.043982814
COG0005,0.064613057,0.03924007,0.105262559,0.076839235,0.031070155
COG0006,0.079920475,0.188586049,0.123607421,0.27101229,0.274806929
COG0007,0.051727492,0.066311584,0.080655401,0.027024185,0.059156417
COG0008,0.126254841,0.108478559,0.139106704,0.056430812,0.099823028
我在 ggplot2 中使用来自 遵循 stackexchange 上的这个答案。
> library(ggplot2)
> foo = read.table('foo.txt', header=T, sep=',')
> foomelt = melt(foo)
Using COG as id variables
> ggplot(foomelt, aes(x=COG, y=variable, fill=value)) + geom_tile() + scale_fill_gradient(low='white', high='steelblue')
它产生了一个非常好的热图，但我真的只是在每个图块的颜色代码之后（基本上是原始的 foo 但用颜色代码代替每个变量）。知道该怎么做吗？
Using this dummy code saved in a file named foo.txt...
COG,station1,station2,station3,station4,station5
COG000Z,0.019393497,0.183122497,0.089911227,0.283250444,0.074110521
COG0002,0.044632051,0.019118032,0.034625785,0.069892277,0.034073709
COG0001,0.033066112,0,0,0,0
COG0004,0.115086472,0.098805295,0.148167492,0.040019101,0.043982814
COG0005,0.064613057,0.03924007,0.105262559,0.076839235,0.031070155
COG0006,0.079920475,0.188586049,0.123607421,0.27101229,0.274806929
COG0007,0.051727492,0.066311584,0.080655401,0.027024185,0.059156417
COG0008,0.126254841,0.108478559,0.139106704,0.056430812,0.099823028
I made a heatmap in ggplot2 with the accompanying code from following this answer on stackexchange.
> library(ggplot2)
> foo = read.table('foo.txt', header=T, sep=',')
> foomelt = melt(foo)
Using COG as id variables
> ggplot(foomelt, aes(x=COG, y=variable, fill=value)) + geom_tile() + scale_fill_gradient(low='white', high='steelblue')
It produces a really nice heatmap, but I'm really just after the color codes of each tile (basically the original foo but with color codes in place of each variable). Any idea how to go about this?
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我正在努力将所有与比例相关的代码从 ggplot2 提取到一个单独的包中 - 这将使以不同方式使用相同比例变得更加容易。有关正在进行的代码，请参阅 https://github.com/hadley/scales。
I'm working on pulling all scale related code from ggplot2 into a separate package - this will make it much easier to use the same scales in different ways. See https://github.com/hadley/scales for the in progress code.
不要从图中提取颜色，而是使用
colorRampPalette：其中
n是热图中的颜色数量。在您的示例中，我得到n=6所以：返回
并
返回
Rather than extracting the colours from the plot, use
colorRampPalette:where
nis the number of colours in your heat map. In your example, I getn=6so:returns
and
returns