r - 如何在R中订购一个情节

Question

我有这个情节R，目前是无序的。如何按基因密度自动排序图，而无需手动指定顺序？有没有命令可以做到这一点？

species_name <- c("hepatitis D","HIV-1","influenza A","pandoravirus")
species_name
genome_size <- c(1.7, 9.7, 14, 2800)
genome_size
gene_counts <- c(1,9,11 ,2500)
gene_counts
gene_density = gene_counts / (genome_size/1000)
gene_density
expn <- data.frame (species_name, genome_size, gene_counts, gene_density)
barplot(gene_density ,names.arg=species_name,ylim=c(0,1000),xlab="species_name",ylab="gene_density",col="coral",main="Gene Density",border="coral2")

标签： rplotbar-chart

Answer 1

利用reorder

library(ggplot2)

expn %>%
  ggplot()+
  geom_col(aes(x = reorder(species_name, gene_density), gene_density), fill = "coral") +
  ggtitle("Gene Density") + xlab("species_name") + ylab("gene_density")