r - 如何在 geom_tile ggplot 中保留图 block 的顺序

Question

我正在尝试绘制 geom_tile 图，但在尝试保留图 block 顺序时遇到了困难。这是一个示例数据集

head(data2.2)
      wt_mt_up                                         GO ont
1285 10.692307                          proline transport  BP
784  10.319457        salicylic acid biosynthetic process  BP
743   9.550895               systemic acquired resistance  BP
1729  8.563280   response to endoplasmic reticulum stress  BP
841   7.910318 defense response, incompatible interaction  BP
1823  7.765033              defense response to bacterium  BP

p2 <- ggplot(data2.2, aes(x=ont, y=GO, fill = wt_mt_up)) + 
      geom_tile() +
      scale_fill_gradient(legend_title, low="white", high="red") + theme(axis.text.x = element_text(angle = 45, hjust = 1, size = 12)) + theme(axis.text.y = element_text(hjust = 1, size = 12))

p2

如您在输出图中所见，尽管 GO = "proline transport"的最大值为 10.692307，但它位于图的中间某处。其他人也一样。理想情况下，我希望它们从高值堆叠到低值。

Answer 1

以上问题的答案如下

p2 <- ggplot(data2.2, aes(x=ont, y=reorder(GO, wt_mt_up), fill = wt_mt_up)) + 
      geom_tile() +
      scale_fill_gradient(legend_title, low="white", high="red") +        
      theme(axis.text.x = element_text(angle = 45, hjust = 1, size = 12)) +  
      theme(axis.text.y = element_text(hjust = 1, size = 12))
p2