如何将图表名称放在中间？

Question

我做了分析并制作了图表，但图表的名称在左侧，如何将其放置在中间？

qplot(data=d2, dist, xlab="Length of brake path (m)", ylab="Number of vehicles", main="Data from 1920")

Answer 1

你可以

qplot(
    data = mtcars,
    as.factor(gear), 
    xlab = "Number of cylinders",
    ylab = "Number of vehicles",
    main = "Data from mtcars") +
theme(plot.title = element_text(hjust = 0.5))