r格子-bwplot后水平abline的错误位置 [英] r lattice - wrong position of horizontal abline after bwplot

问题描述

我可以做到这一点而没有问题:

I can do this without problems:

boxplot(coef ~ habitat, data = res)
abline(h = 0, col = "green")

但是当我使用点阵时，水平线放错了位置:

But when I use lattice, the horizontal line is misplaced:

bwplot(coef ~ habitat, data = res)
abline(h = 0, col = "green")

我尝试改用panel.abline，但是这会将绿线放在图片的顶部.

I tried to use panel.abline instead but that places the green line on top of the picture.

推荐答案

使用面板功能；按照您希望添加零件的顺序订购所包含的功能；利用...避免必须了解/管理面板功能的所有参数

Use a panel function; order the contained functions in the order you'd like parts added; make use of ... to avoid having to know / manage all parameters to the panel function

bwplot(coef ~ habitat, data = res, panel=function(...) {
    panel.abline(h=0, col="green")
    panel.bwplot(...)
})

当有多个面板时，面板功能的概念更有意义，例如，

The notion of a panel function makes more sense when there are several panels, e.g.,

res = data.frame(coef=rnorm(99) + (-1):1, habitat=sample(letters[1:3], 99, TRUE),
                 grp=c("W", "X", "Y"))
bwplot(coef ~ habitat | grp, data = res, panel=function(x, y, ...) {
    ## green line at panel-median y value
    panel.abline(h=median(y), col="green")
    panel.bwplot(x, y, ...)
})

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