您的代码工作正常，但barplot从低到高排序。如果您想将酒吧从高到低排序，您必须在值之前添加 - 标记：

Your code works fine, except that the barplot is ordered from low to high. When you want to order the bars from high to low, you will have to add a -sign before value:

ggplot(corr.m, aes(x = reorder(miRNA, -value), y = value, fill = variable)) + 
  geom_bar(stat = "identity")

给出：