比例=“免费"适用于facet_wrap但不适用于facet_grid [英] Scales = "free" works for facet_wrap but doesn't for facet_grid

问题描述

我试图理解为什么facet_grid()和facet_wrap()的输出不同，即使输入相同:

I'm trying to understand why the outputs of facet_grid() and facet_wrap() are different, even though the inputs are the same:

ggplot(temp, aes(x = valor)) +
geom_histogram(binwidth = 5, fill = NA, color = "black") +
facet_grid(estratificacao ~ referencia, scales = "free") +
scale_x_continuous(breaks = seq(0, 100, 10)) + theme_classic()

ggplot(temp, aes(x = valor)) +
geom_histogram(binwidth = 5, fill = NA, color = "black") +
facet_wrap(estratificacao ~ referencia, scales = "free") +
scale_x_continuous(breaks = seq(0, 100, 10)) + theme_classic()

请参见，参数scales = "free"对于facet_grid()和facet_wrap()具有不同的行为.有什么可以解释的?

See, the argument scales = "free" does not have the same behaviors for facet_grid() and facet_wrap(). What can explain that?

推荐答案

引用此链接:

facet_grid用一个或两个在水平和/或垂直方向上变化的变量将数据划分为多个方面，而facet_wrap将这些方面彼此相邻，并包裹一定数量的列或行.换句话说，facet_wrap仅具有水平尺寸.

facet_grid split the data into facets by one or two variables that vary on the horizontal and/or vertical direction, while facet_wrap places the facets next to each other, wrapping with a certain number of columns or rows. In other words, facet_wrap only has horizontal dimension.

因此，使用该链接中的示例，sp + facet_grid(. ~ sex)的行为与sp + facet_grid( ~ sex)相同.就您而言，facet_grid(. ~ referencia)和facet_wrap( ~ referencia)应该产生相同的图.

Therefore, using the example from that link, sp + facet_grid(. ~ sex) would behave the same as sp + facet_grid( ~ sex). In your case, facet_grid(. ~ referencia) and facet_wrap( ~ referencia) should produce the same plot.

对于二维面或更多的二维面，facet_grid根据参数(vertical ~ horizontal)生成图的网格.另一方面，facet_wrap只会水平堆叠图.然后，用户可以通过指定列数或行数来设置布局.

For two or more dimensional facets, facet_grid produces a grid of plots based on the parameter (vertical ~ horizontal). facet_wrap, on the other hand, would just stack the plots horizontally. User then can set the layout by specifying the number of columns or rows.

现在，当添加scales = "free"自变量时，facet_grid中的构面仍将受到网格的限制，因此同一行上的图不能具有不同的y轴.同样，每列只能有一个x轴.不过，使用facet_wrap可以独立显示每个图，因此可以释放"其x轴和y轴.

Now, when the scales = "free" argument is added, facets in facet_grid would still be bounded by the grid, therefore plots on the same row cannot have different y-axis. Similarly, there can only single x-axis for each column. Using facet_wrap though, each plot is displayed independently, so it can "free" its x-axis and y-axis.

在我看来，当您想相对比较类别中的图时，facet_grid很有用，这可以通过设置相同的轴比例来实现.同时，facet_wrap对于彼此之间更加独立的图更为有用.

In my opinion, facet_grid is useful when you want to relatively compare the plots within a category, which can be accomplished by setting the same axis scales. Meanwhile, facet_wrap is more useful for plots that more independent between one another.

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