R ggplot2 - 错误栏宽度问题

Question

我一直在尝试使用 ggplot2 绘制以下数据，但我运行遇到了错误栏的问题：

data1<-c(0.04, 0.5, 1.0, 1.5 ,2.0, 2.6, 3.1, 3.6,  0.9,0.56,0.4,0.33,0.27,0.2,0.15,0.1, 0.12, 0.17, 0.22 ,0.33, 0.45,  0.57, 0.74, 0.85)

sym<-as.data.frame(matrix(data = data1, ncol = 3, byrow = FALSE))

ggplot(data=sym, mapping = aes(x=sym[,1], y=sym[,2]))+
  theme(plot.background = element_rect(fill = "white"), 
        panel.background = element_rect(fill = "white", color="black",linetype = 1),
        panel.grid = element_blank(),
        plot.title = element_text(hjust = 0.5, size =30),
        axis.title = element_blank(),
        axis.ticks = element_line(color="black"),
        axis.ticks.length=unit(-0.25, "cm"),
        axis.text.x = element_text(margin=unit(c(0.5,0.5,0.5,0.5), "cm")), 
        axis.text.y = element_text(size=25, margin=unit(c(0.5,0.5,0.5,0.5), "cm")))+
  ggtitle("variable, symmetric error")+
  ylim(-1.0, 1.5)+
  xlim(0.0,4.5)+
  geom_line(color="blue",size=1.2)+
  geom_point(color="blue", size=4)+
  geom_errorbar(aes(ymin = sym[,2]-sym[,3], ymax = sym[,2]+sym[,3], x= sym[,1]),
                width=0.1, color="blue", size =1.2)

结果（主要）符合预期，但我不明白为什么第一个错误栏不响应“宽度”设置。 Plot showing the issue with the first errorbar, which is not responding to the set width parameter

我的第一个猜测是改变页边距可能会导致某种重叠，这导致 R 没有在第一个点的宽度方向上绘制。然而，将数据在 x 轴上向内移动没有任何区别。因此，我假设我一定错过了其他东西？

非常感谢任何意见！

Answer 1

指出@stefan 和@RuiBarradas 关于变量名称和限制的重要建议，您还可以尝试使用 scale_x_continuous() 和 scale_y_continuous() 作为限制，因为它在下一个代码中使用：

ggplot(data=sym, mapping = aes(x=V1, y=V2))+
  theme(plot.background = element_rect(fill = "white"), 
        panel.background = element_rect(fill = "white", color="black",linetype = 1),
        panel.grid = element_blank(),
        plot.title = element_text(hjust = 0.5, size =30),
        axis.title = element_blank(),
        axis.ticks = element_line(color="black"),
        axis.ticks.length=unit(-0.25, "cm"),
        axis.text.x = element_text(margin=unit(c(0.5,0.5,0.5,0.5), "cm")), 
        axis.text.y = element_text(size=25, margin=unit(c(0.5,0.5,0.5,0.5), "cm")))+
  ggtitle("variable, symmetric error")+
  scale_y_continuous(limits = c(NA,1.5))+
  scale_x_continuous(limits = c(NA,4.5))+
  geom_line(color="blue",size=1.2)+
  geom_point(color="blue", size=4)+
  geom_errorbar(aes(ymin = V2-V3, ymax = V2+V3, x= V1),
                width=0.1, color="blue", size =1.2)

R ggplot2 - 错误栏宽度问题

R ggplot2 - issue with errorbar width

graphics

r

width

ggplot2

errorbar