如何在R中使用ggplot2绘制直向同源群（COG）棒图的群集？ [英] How to draw Clusters of Orthologous Groups (COG) bar plot using ggplot2 in R?

问题描述

我是R新手，我有一些数据如下，我想绘制一个与这个与R程序（linux或Rstudio）中的pkg :: ggplot2。

I am new to R and I have some data as below and I want to draw a histogram same as this with pkg::ggplot2 in R program (linux or Rstudio).

正如你所看到的它是X轴（功能类）中从A到Z的字母，Y中的数字是频率，重要的一点是每个小节都有它自己的独特颜色。

As you can see it is the letters from A to Z in the X axis (Function class) and the frequencies as numbers in the Y and the important point is this that each bar has its own unique color.

另外，还有一个 color help = legend ，它用每个条的相同颜色描述每个类，我不确定它是否是R ggplot2包的某些特征？

In addition, there is a "color help = legend" that describe each class by the same color of each bars that I am not sure if it is some characteristics of R ggplot2 package or not?

我检查了一些在线帮助，但我不知道如何在ggplot2中插入我的数据并为每个类指定一个唯一的颜色。

I have checked some online helps but I do not know how to insert my data in the ggplot2 and assign a unique color for each class.

我的数据样本：

my data sample:

A   5   RNA processing and modification 
B   2   Chromatin structure and dynamics 
C   18  Energy production and conversion 
D   26  Cell cycle control, cell division, chromosome partitioning
E   15  Amino acid transport and metabolism 
F   5   Nucleotide transport and metabolism 
G   13  Carbohydrate transport and metabolism 
H   6   Coenzyme transport and metabolism 
I   15  Lipid transport and metabolism 
J   20  Translation, ribosomal structure and biogenesis 
K   24  Transcription 
L   28  Replication, recombination and repair
M   18  Cell wall/membrane/envelope biogenesis 
N   1   Cell motility 
O   29  Posttranslational modification, protein turnover, chaperones 
P   19  Inorganic ion transport and metabolism 
Q   16  Secondary metabolites biosynthesis, transport and catabolism 
R   85  General function prediction only 
S   20  Function unknown 
T   32  Signal transduction mechanisms 
U   14  Intracellular trafficking, secretion, and vesicular transport 
V   6   Defense mechanisms 
Z   14  Cytoskeleton 

推荐答案

那些字母AZ旁边的数字是酒吧的高度？如果是这样，你最好使用barplot：

Are those numbers next to the letters A-Z the height of the bars? If so, you're better of using a barplot:

library(ggplot2)
# Simulate some data
obs = rpois(10, 5)
group = factor(1:10)
df = data.frame(obs, group)
ggplot(data = df, aes(x = group, y = obs, color = group, fill = group)) + 
  geom_bar(stat = 'identity')

为了获得一般的彩条，确保你的数据框有一个分组变量（必须是一个因子，否则你会得到连续的颜色分配），然后在 aes 分配颜色/填充列名的值。

To get the colored bars in general, make sure your dataframe has a grouping variable (must be a factor, otherwise you get continuous color assignment) and then in aes assign color/fill the value of the column name.

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