R 使用geom_箱线图的系数时更改x轴限制

当使用因子作为x轴比例时，是否可以将x轴限制两侧增加1。例如，在下图中，是否可以将xlimits更改为3和9？i、 e.

xlim（3,9）

当我尝试

scale\x\u continuous（limits=c（3,9））

时，我得到：

Error in if (zero_range(from) || zero_range(to)) return(rep(mean(to),  : 
  missing value where TRUE/FALSE needed
In addition: Warning messages:
1: In loop_apply(n, do.ply) :
  no non-missing arguments to min; returning Inf
2: In loop_apply(n, do.ply) :
  no non-missing arguments to max; returning -Inf
3: In loop_apply(n, do.ply) :
  position_dodge requires constant width: output may be incorrect

---

您需要

缩放x\u离散

：

p <- ggplot(mtcars, aes(factor(cyl), mpg))
p + geom_boxplot() + scale_x_discrete(limits = c("4","6"))

编辑：要求包括更广泛的范围。要包含其他值，您需要在因子列表上使用breaks函数：

p <- ggplot(mtcars, aes(factor(cyl), mpg))
p + geom_boxplot() +
    scale_x_discrete(breaks = factor(3:9), limits = c("3", "4", "5", "6", "7", "8", "9"))

或在打印前将其过滤掉：

mtcars<-mtcars[mtcars$cyl!=8,]

---

mtcar是否可以使限值低于4（3）并高于8（9），而不会出现错误？这样做的原因是将其与条形图对齐。
p <- ggplot(mtcars, aes(factor(cyl), mpg))
p + geom_boxplot() + xlim("4", "6")

p <- ggplot(mtcars, aes(factor(cyl), mpg))
p + geom_boxplot() +
    scale_x_discrete(breaks = factor(3:9), limits = c("3", "4", "5", "6", "7", "8", "9"))

p + geom_boxplot() +
  scale_x_discrete(breaks=factor(c("3","4","5","6","7", "eight", "9")),
                   limits = c("3", "4", "5", "6", "7", "eight", "9") 

mtcars<-mtcars[mtcars$cyl!=8,]