顏色直方圖與R中

Question

分類變量填充我試圖創建一個情節是這樣的：

qplot(carat, data = diamonds, geom = "histogram", fill = color) 

然而，代替具有用於x軸的定量變量，我使用的分類數據。我使用的數據幀是這樣的：

refBases=c("A","A","A","C","C","C","G","G","G","T","T","T") 
altBases=c("C","G","T","A","G","T","A","C","T","A","C","G") 
myDF$ref=refBases 
myDF$alt=altBases 
myDF$Freq=c(5,2,3,6,9,6,8,6,7,4,6,4) 

所以，基本上，我想我的情節看起來相同，不同之處在於，x軸將是從裁判柱（A，C，G四個組，T）; y軸將是Freq;顏色圖例將是alt列（A，C，G，T）中的四個變量。因此，基本上，x軸上會有四個參考箱，每個都沿着y軸分成三個部分，顏色圖例指示alt值。

我得到了一些蠢話，當我嘗試我的期望：

qplot(ref,Freq,data=myDF,fill=alt) 

Answer 1

什麼你所描述聽起來不像一個直方圖（這是連續隨機變量來估算內核非常具體情節密度）;聽起來像你只是想要一個條形圖。我相信這是你在找什麼

myDF <- data.frame(
    ref=c("A","A","A","C","C","C","G","G","G","T","T","T"), 
    alt=c("C","G","T","A","G","T","A","C","T","A","C","G"), 
    Freq=c(5,2,3,6,9,6,8,6,7,4,6,4) 
) 

library(ggplot2) 
ggplot(myDF, aes(ref, Freq, fill=alt)) + 
    geom_bar(stat="identity", position="dodge")