如何解决当我尝试用ylim函数限制y轴时为什么会出现错误
我无法将y极限值编辑为所需的比例尺。这是代码：
df <- read.table(text = "Site Type Day1 Day2 Day3
A SD 780 431 295
B SD 350 377 255
B M 480 179 560
A M 240 876 789
C FO 840 179 NA
C FI 350 NA 255
A NF 508 NA 565
B NF 405 876 NA ",header = TRUE)
library(dplyr)
library(tidyr)
library(ggplot2)
df %>%
pivot_longer(cols = -c(Site,Type)) %>%
mutate(Type = factor(Type,levels = c('SD','M','NF','FO','FI'),ordered = T)) %>%
ggplot(aes(x=Site,y=value,fill=name,ylim=c(0,25000)))+
geom_bar(stat='identity')+
facet_wrap(.~Type,scales = 'free_x',ncol = 5,strip.position = "bottom")+
theme_minimal()+
theme(strip.placement = "outside",panel.spacing = unit(0,"points"),strip.background = element_blank(),strip.background.y = element_blank(),panel.background = element_rect(fill = "yellow"),panel.grid.major = element_blank(),panel.grid.minor = element_blank(),panel.border = element_blank(),strip.text = element_text(face = "bold",size = 9))+
scale_color_discrete(name="Legend",label=c("Day 1","Day 2","Day 3"))
但是，当我删除ylim=c(0,25000)时，不会出现此错误。我想将其应用到另一个具有不同尺度的相似数据集。
解决方法
您需要使用ylim()中的ggplot2函数：
df %>%
pivot_longer(cols = -c(Site,Type)) %>%
mutate(Type = factor(Type,levels = c('SD','M','NF','FO','FI'),ordered = T)) %>%
ggplot(aes(x=Site,y=value,fill=name))+
ylim(0,25000) +
geom_bar(stat='identity')+
facet_wrap(.~Type,scales = 'free_x',ncol = 5,strip.position = "bottom")+
theme_minimal()+
theme(strip.placement = "outside",panel.spacing = unit(0,"points"),strip.background = element_blank(),strip.background.y = element_blank(),panel.background = element_rect(fill = "yellow"),panel.grid.major = element_blank(),panel.grid.minor = element_blank(),panel.border = element_blank(),strip.text = element_text(face = "bold",size = 9))+
scale_color_discrete(name="Legend",label=c("Day 1","Day 2","Day 3"))
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