是否可以仅对facet_wrap 的各个方面进行重新排序，而不对基础因子级别进行重新排序？

示例数据框：

df <- data.frame(x=rep(1:10,4),y=rnorm(40),Case=rep(c("B","L","BC","R"),each=10))

我可以使用以下方法在其自己的方面绘制每个时间序列：

ggplot(df,aes(x=x,y=y,color=Case)) + geom_line()+facet_wrap(~Case,nr=2,nc=2)

Now, suppose I want to change the facet order to (starting from top-left and going to bottom-right along rows) "L","B","R","BC". The usual suggestion here on SO is to do this https://stackoverflow.com/questions/18066870/reorder-levels-of-facet-wrap-using-ggplot. However, if I reorder the levels of factor Case, also the colors of the curves will be changed. Is it possible to reorder the facets, without changing also the order of the curve colors? I know it sounds like a weird question. The problem is that my report is a work in progress, and in a older version of the report, which I already showed to coworkers & management, there were multiple plots more or less like this (with no facet_wrap):

ggplot(df,aes(x=x,y=y,color=Case)) + geom_line()

换句话说，现在人们已经习惯将“B”与红色联系起来。如果我重新排序，“L”将是红色，“B”将是绿色，依此类推。我已经听到了抱怨……有什么办法可以解决这个问题吗？

按照您想要的顺序将数据复制到新列中。使用新列进行刻面，使用旧列进行颜色。

df$facet = factor(df$Case, levels = c("L", "B", "R", "BC"))

ggplot(df, aes(x = x, y = y, color = Case)) + 
    geom_line() + 
    facet_wrap(~facet, nr = 2)