用ggplot2，R在负y轴上绘制密度图

问题描述：

我正在尝试在x轴的两侧绘制密度-试图可视化映射到基因组区域的两条链的读段.

I'm trying to plot densities on both sides of the x axis - trying to visualize reads mapping to both strands of a genomic region.

我有两个问题:

我想使用ggplot2但

我不知道如何从绘图对象中提取数据，或者反转已经制作的绘图.

I don't know how to extract the data from the plot object, or invert the plot that has already been made.

任何帮助都将不胜感激！

Any help greatly appreciated!

答

您的问题还不清楚，但是我发现"x轴两侧的密度"可能很有趣.因此，也许您正在尝试执行以下操作:

Your question is very unclear, but I found the "densities on both sides of the x axis" potentially interesting. So maybe you're trying to do something like this:

d <- data.frame(x = rnorm(1000),x1 = rnorm(1000,sd = 0.5))

ggplot(data = d,aes(x = x)) + 
    geom_density() + 
    geom_density(aes(x = x1,y = -(..density..)))

用ggplot2，R在负y轴上绘制密度图

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