按值重新排序 geom_bar ggplot2 中的条形 [英] Reorder bars in geom_bar ggplot2 by value
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问题描述
我正在尝试制作一个条形图,其中该图从具有最高 value
的 miRNA
到具有最高 miRNA
的miRNA
排序最低.为什么我的代码不起作用?
I am trying to make a bar-plot where the plot is ordered from the miRNA
with the highest value
to the miRNA
with the lowest. Why does my code not work?
> head(corr.m)
miRNA variable value
1 mmu-miR-532-3p pos 7
2 mmu-miR-1983 pos 75
3 mmu-miR-301a-3p pos 70
4 mmu-miR-96-5p pos 5
5 mmu-miR-139-5p pos 10
6 mmu-miR-5097 pos 47
ggplot(corr.m, aes(x=reorder(miRNA, value), y=value, fill=variable)) +
geom_bar(stat="identity")
推荐答案
你的代码工作正常,只是条形图是从低到高排序的.当你想从高到低排列条形时,你必须在 value
前添加一个 -
符号:
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:
使用的数据:
corr.m <- structure(list(miRNA = structure(c(5L, 2L, 3L, 6L, 1L, 4L), .Label = c("mmu-miR-139-5p", "mmu-miR-1983", "mmu-miR-301a-3p", "mmu-miR-5097", "mmu-miR-532-3p", "mmu-miR-96-5p"), class = "factor"),
variable = structure(c(1L, 1L, 1L, 1L, 1L, 1L), .Label = "pos", class = "factor"),
value = c(7L, 75L, 70L, 5L, 10L, 47L)),
class = "data.frame", row.names = c("1", "2", "3", "4", "5", "6"))
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