更改 geom_tile() 中的中断

Question

我有矩阵数据，想使用 geom_tile() 创建热图。 geom_tile() 成功运行，但“值”的限制似乎变长了。（例如，超过 100 的值是相同的颜色中断）。我想将结果与其他数据集进行比较，所以我认为图形之间相同的颜色中断更好。

　Var1 <- c(0,3,31,316,3162,0,3,31,316,3162,0,3,31,316,3162,0,3,31,316,3162,0,3,31,316,3162)
  Var2 <- c(0,0,0,0,0,3,3,3,3,3,31,31,31,31,31,316,316,316,316,316, 3162, 3162, 3162, 3162, 3162)
  value <- c(67,79,90,20, 5,10,88,82,11, 1, 2,17, 107,41, 4, 3,15,81,66,12, 1, 3,14,16,23)
  longData <- data.frame(cbind(Var1, Var2, value))      

ggplot(longData, aes(x = as.character(Var1), y = as.character(Var2))) + 
      geom_tile(aes(fill=value)) + 
      scale_fill_steps(low="grey90", high="red",  breaks=c(0, 10, 25, 50, 100, 150, 200, 300)) +
      labs(x="2000", y="2007", title="Matrix")+
      geom_text(aes(label = value))

-----更新-----

我想比较这两个图，但显示的颜色因值而异。

Var1 <- c(3, 31,316,3162,3,31,316,3162,3,31, 316,3162,3,31,316, 3162, 31,316,3162)
Var2 <- c(0,0,0,0,3,3,3,3,31,31,31,31,316,316,316,316,3162,3162,3162)
value <- c(36,34,9,4,129,59,12,2,37,277,50,10,3,23,106,22,5,9, 31)
longData2 <- data.frame(cbind(Var1, Var2, value))

ggplot(longData2, aes(x = as.character(Var1), y = as.character(Var2))) + 
      geom_tile(aes(fill=value)) + 
      scale_fill_steps(low="grey90", high="red",  breaks=c(0, 10, 25, 50, 100, 150, 200, 300)) +
      labs(x="2007", y="2012", title="Matrix")+
      geom_text(aes(label = value))

Answer 1

这似乎比我想象的要难。看来您还需要照顾重新缩放器。为了保持两者相同，您可以定义一次比例，例如

my_fill <- scale_fill_steps(low="grey90", high="red",  
                         breaks=c(0, 10, 25, 50, 100, 150, 200, 300), 
                         rescale=function(x, ...) scales::rescale(x, from=c(0, 300)),
                         limits=c(0,300))

然后将其用于两个图

ggplot(longData, aes(x = as.character(Var1), y = as.character(Var2))) + 
  geom_tile(aes(fill=value)) + 
  my_fill +   
  labs(x="2007", y="2012", title="Matrix")+
  geom_text(aes(label = value))
ggplot(longData2, aes(x = as.character(Var1), y = as.character(Var2))) + 
  geom_tile(aes(fill=value)) + 
  my_fill + 
  labs(x="2007", y="2012", title="Matrix")+
  geom_text(aes(label = value))

更改 geom_tile() 中的中断

changing the breaks in geom_tile()

r

geom-tile