连接点

Question

我有以下情节

require(ggplot2)

dtf <- structure(list(Variance = c(5.213, 1.377, 0.858, 0.613, 0.412, 0.229, 0.139, 0.094, 0.064), Component = structure(1:9, .Label = c("PC1", "PC2", "PC3", "PC4", "PC5", "PC6", "PC7", "PC8", "PC9"), class = "factor")), .Names = c("Variance", "Component"), row.names = c(NA, -9L), class = "data.frame")

ggplot(dtf, aes(x = Component, y = Variance)) +
geom_point()

我只想用直线连接点。我试过了+geom_line()，但却产生了错误

Answer 1

您的x值是离散的（因子），geom_line()每个唯一x值都被视为单独的组，并尝试仅在此组内连接点。在group=1中设置aes()可确保将所有值视为一个组。

ggplot(dtf, aes(x = Component, y = Variance,group=1)) +
  geom_point()+geom_line()

Answer 2

这会将点绘制为x作为因子类别的整数值：

 ggplot(dtf, aes(x = as.numeric(Component), y = Variance)) +
      geom_point() + geom_line()

您可以使用以下内容放回类别标签：

ggplot(dtf, aes(x = as.numeric(Component), y = Variance)) +
  geom_point() +geom_line() + scale_x_discrete(labels=dtf$Component)