r - 如何在格子 bwplot 中手动设置多个箱线图的比例？

Question

我得到了聚类的结果，并决定使用格子为每个聚类制作一个箱线图。接下来，我需要建立一个所有聚类箱线图都能接受的比例。

找到了一个解决方案，允许排除异常值并设置自由关系。

library(lattice)
trellis.device(new=FALSE, col=FALSE)

bwplot(value ~ variable | Cluster, data = test, 
       layout = c(2,2), 
       prepanel = function(x, y) {
               bp <- boxplot(split(y, x), plot = FALSE)
               ylim <- range(bp$stats)
               list(ylim = ylim) },
       scales = list(y = list(relation = "free")),
       do.out = F)

所以，我得到了非常好的图，但如果我为每个图手动设置 ylim 会更好。例如，我的数据中只有整数值，左上角聚类图中的值 0.5 没有意义。

那么，有什么方法可以在bwplot参数中设置多个ylim吗？

Answer 1

来自 ?bwplot 下的文档:

xlim could also be a list, with as many components as the number of panels (recycled if necessary), with each component as described above. This is meaningful only when scales$x$relation is "free", in which case these are treated as if they were the corresponding limit components returned by prepanel calculations.

ylim 参数具有 y 轴的相应功能。

因此，在 scales 参数中设置 relation = "free"，然后将列表传递给 ylim 参数为每个面板单独设置 y 轴限制:

bwplot(len ~ factor(dose) | supp, data = ToothGrowth,
    scales = list(relation = "free"),
    ylim = list(c(5, 31), c(0, 36)))