在xyplot中的特定值上绘制网格线 [英] Draw grid lines on specific values in xyplot

问题描述

我有一个xyplot，我想在0值上绘制网格线.

I have a xyplot and I want to draw grid lines on the 0 values.

这怎么办?

推荐答案

如果您使用的是包lattice(用xyplot隐含)，则可以使用panel.abline在标记的刻度上画线. /p>

If you're using package lattice (which is implied with xyplot), you can use panel.abline to draw lines over labeled ticks.

my.df <- data.frame(a = runif(10, min = -1, max = 1), b = runif(10, min = -1, max = 1))
my.plot <- xyplot(b ~ a, data = my.df)
update(my.plot, panel = function(...) {
            panel.abline(h = 0, v = 0, lty = "dotted", col = "light grey")
            panel.xyplot(...)
        })

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