如何使用ggplot2控制绘图的尺寸/大小

library(ggplot2)

# 创建一个简单的绘图
p <- ggplot(data = mtcars, aes(x = wt, y = mpg)) + geom_point()

# 设置绘图尺寸
width <- 8
height <- 6

# 保存绘图
ggsave(filename = "myplot.png", plot = p, width = width, height = height, dpi = 300)

library(ggplot2)

# 设置图形尺寸
options(repr.plot.width = 8, repr.plot.height = 6)

# 创建一个简单的绘图
p <- ggplot(data = mtcars, aes(x = wt, y = mpg)) + geom_point()

# 打印绘图
print(p)