在ggplot2中的x和y轴上手动添加中断

Question

我通常使用scale_y_continuous（或scale_x_continuous）更改了ggplot2中连续变量的小数位数。我通常也使用coord_cartesian(xlim=)（或ylim=y轴）设置轴限制。一切正常，如下所示：

#Some example data
set.seed(100)
b<-sample(1:10, 10)
a<-sample(1:10, 10)

df<-data.frame(a,b)

#Graph without scales set (just default)
library(ggplot2)
ggplot(data=df, aes(a,b))+
  theme_bw() + theme(panel.border = element_rect(colour = "black", fill=NA, size=1), 
                     panel.grid.major = element_blank(), 
                     panel.grid.minor = element_blank(), 
                     axis.line = element_line(colour = "black"))+
  geom_text(aes(label=rownames(df)), color="black")

这将产生以下具有默认比例的图：

如果我想将x轴调整为1-13（即从1开始到13结束的13个刻度），我将执行以下操作：

ggplot(data=df, aes(a,b))+
  theme_bw() + theme(panel.border = element_rect(colour = "black", fill=NA, size=1), 
                     panel.grid.major = element_blank(), 
                     panel.grid.minor = element_blank(), 
                     axis.line = element_line(colour = "black"))+
  geom_text(aes(label=rownames(df)), color="black")+
  scale_x_continuous(breaks = c(1,3,5,7,9,11,13))+
  coord_cartesian(xlim=c(0, 13))

...对于y轴...

ggplot(data=df, aes(a,b))+
  theme_bw() + theme(panel.border = element_rect(colour = "black", fill=NA, size=1), 
                     panel.grid.major = element_blank(), 
                     panel.grid.minor = element_blank(), 
                     axis.line = element_line(colour = "black"))+
  geom_text(aes(label=rownames(df)), color="black")+
  scale_y_continuous(breaks = c(1,3,5,7,9,11,13))+
  coord_cartesian(ylim=c(0, 13))

但是，当我尝试同时对两个轴完成完全相同的比例调整时，输出不会产生我期望的结果（x和y轴均为1-13）。

ggplot(data=df, aes(a,b))+
  theme_bw() + theme(panel.border = element_rect(colour = "black", fill=NA, size=1), 
                     panel.grid.major = element_blank(), 
                     panel.grid.minor = element_blank(), 
                     axis.line = element_line(colour = "black"))+
  geom_text(aes(label=rownames(df)), color="black")+
  scale_y_continuous(breaks = c(1,3,5,7,9,11,13))+
  coord_cartesian(ylim=c(0, 13))+
  scale_x_continuous(breaks = c(1,3,5,7,9,11,13))+
  coord_cartesian(xlim=c(0, 13))

如您所见，即使两个轴都传递了完全相同的代码，x和y轴也不相等。我不明白为什么。任何帮助深表感谢。

Answer 1

set.seed(100)
df <- data.frame(b = sample(1:10, 10), a = sample(1:10, 10))    


ggplot(data=df, aes(a,b))+
theme_bw() + theme(panel.border = element_rect(colour = "black", fill=NA, size=1), 
                   panel.grid.major = element_blank(), 
                   panel.grid.minor = element_blank(), 
                   axis.line = element_line(colour = "black")) +
geom_text(aes(label=rownames(df)), color="black") +
scale_y_continuous(breaks = c(1,3,5,7,9,11,13)) +
scale_x_continuous(breaks = c(1,3,5,7,9,11,13)) +
coord_fixed(ylim=c(0, 13),xlim=c(0, 13))