ggplot在同一个面板（facet-grid）中组合线和面积

Question

我正在尝试创建一个面网格。它将有三行四列。我想要两行是线图，一个是堆叠的geom_area。除了当我绘制它时，它总是变成四行 - 两行，两个区域。我希望这两个领域相互交叠。我怎样才能解决这个问题？

library(ggplot2) 
rawdata_Fig1 <- read.table(text=" 
Date Number mMP Day Rep Parameter FeType Value 
13/03/2016 1 0 2 1 pH NA 3.11 
13/03/2016 2 0 2 2 pH NA 3.13 
13/03/2016 3 0 2 3 pH NA 3.43 
13/03/2016 4 0 2 4 pH NA 3.49 
21/04/2016 0 10 41 1 pH NA 2.87 
21/04/2016 0 10 41 2 pH NA 2.87 
21/04/2016 0 10 41 3 pH NA 2.87 
21/04/2016 0 10 41 4 pH NA 2.85 
13/03/2016 1 0 2 1 Fe2 Fe2 0.965538462 
13/03/2016 57 1 2 1 Fe2 Fe2 0.217846154 
13/03/2016 113 5 2 1 Fe2 Fe2 0.300153846 
13/03/2016 169 10 2 1 Fe2 Fe2 0.226307692 
21/04/2016 0 0 41 1 Fe2 Fe2 9.277692308 
21/04/2016 0 1 41 1 Fe2 Fe2 13.92 
21/04/2016 0 5 41 1 Fe2 Fe2 4.181538462 
21/04/2016 0 10 41 1 Fe2 Fe2 1.066153846 
13/03/2016 1 0 2 1 'PO4 uM' NA 9.39 
13/03/2016 2 0 2 2 'PO4 uM' NA 0.39 
13/03/2016 3 0 2 3 'PO4 uM' NA -0.06 
13/03/2016 4 0 2 4 'PO4 uM' NA -0.06 
13/03/2016 57 1 2 1 'PO4 uM' NA 0.09 
13/03/2016 58 1 2 2 'PO4 uM' NA -0.06 
13/03/2016 59 1 2 3 'PO4 uM' NA 0.54 
13/03/2016 60 1 2 4 'PO4 uM' NA 0.69 
13/03/2016 113 5 2 1 'PO4 uM' NA 113.19 
13/03/2016 114 5 2 2 'PO4 uM' NA 120.54 
13/03/2016 115 5 2 3 'PO4 uM' NA 144.24 
13/03/2016 116 5 2 4 'PO4 uM' NA 101.34 
13/03/2016 169 10 2 1 'PO4 uM' NA 235.17 
13/03/2016 170 10 2 2 'PO4 uM' NA 263.52 
13/03/2016 171 10 2 3 'PO4 uM' NA 252.72 
13/03/2016 172 10 2 4 'PO4 uM' NA 261.72 
21/04/2016 0 10 41 1 'PO4 uM' NA 17.04 
21/04/2016 0 10 41 2 'PO4 uM' NA 26.79 
21/04/2016 0 10 41 3 'PO4 uM' NA 29.49 
21/04/2016 0 10 41 4 'PO4 uM' NA 23.64 
13/03/2016 1 0 2 1 TotFe TotFe 1.316027906 
13/03/2016 57 1 2 1 TotFe TotFe 0.233872429 
13/03/2016 113 5 2 1 TotFe TotFe 0.273511824 
13/03/2016 169 10 2 1 TotFe TotFe 0.158557579 
21/04/2016 0 0 41 1 TotFe TotFe 12.51812087 
21/04/2016 0 1 41 1 TotFe TotFe 18.02799674 
21/04/2016 0 5 41 1 TotFe TotFe 6.167889825 
21/04/2016 0 10 41 1 TotFe TotFe 1.625215185 
",header=TRUE) 

rawdata_Fig1_Fe <- read.table(text=" 
Date Number mMP Day Rep Parameter Value 
13/03/2016 1 0 2 1 Fe2  0.965538462 
13/03/2016 57 1 2 1 Fe2  0.217846154 
13/03/2016 113 5 2 1 Fe2  0.300153846 
13/03/2016 169 10 2 1 Fe2  0.226307692 
21/04/2016 0 0 41 1 Fe2  9.277692308 
21/04/2016 0 1 41 1 Fe2  13.92 
21/04/2016 0 5 41 1 Fe2  4.181538462 
21/04/2016 0 10 41 1 Fe2  1.066153846 
13/03/2016 1 0 2 1 TotFe  1.316027906 
13/03/2016 57 1 2 1 TotFe  0.233872429 
13/03/2016 113 5 2 1 TotFe  0.273511824 
13/03/2016 169 10 2 1 TotFe  0.158557579 
21/04/2016 0 0 41 1 TotFe  12.51812087 
21/04/2016 0 1 41 1 TotFe  18.02799674 
21/04/2016 0 5 41 1 TotFe  6.167889825 
21/04/2016 0 10 41 1 TotFe  1.625215185 
",header=TRUE) 

Fig1 <-ggplot(rawdata_Fig1,aes(x=Day,y=Value, group=Rep)) 
Fig1Pan=Fig1 + theme_bw() 

Fig1panel=Fig1Pan + facet_grid(Parameter ~ mMP, scales="free") + 
    geom_line(data=subset(rawdata_Fig1, Parameter == "pH")) + 
    geom_line(data=subset(rawdata_Fig1, Parameter == "PO4 uM")) + 
    geom_area(data=rawdata_Fig1_Fe, aes(y=pH, x=Day, fill=Parameter, stat='identity')) 

Fig1panel 

Answer 1

您可以结合两个小行，创造新的fill和group变量相匹配的面层

rawdata_Fig1$Parameter[rawdata_Fig1$Parameter %in% 'Fe2'] <- 'TotFe' 
# rawdata_Fig1 <- droplevels(rawdata_Fig1) 
rawdata_Fig1_Fe$Parameter2 <- rawdata_Fig1_Fe$Parameter 
rawdata_Fig1_Fe$Parameter[rawdata_Fig1_Fe$Parameter %in% 'Fe2'] <- 'TotFe' 

Fig1 <-ggplot(rawdata_Fig1,aes(x=Day,y=Value, group=Rep)) 
Fig1Pan=Fig1 + theme_bw() 

Fig1Pan + facet_grid(Parameter ~ mMP, scales="free") + 
    geom_line(data=subset(rawdata_Fig1, Parameter == "pH")) + 
    geom_line(data=subset(rawdata_Fig1, Parameter == "'PO4 uM'")) + 

    ## I only changed these lines 
    geom_area(data=rawdata_Fig1_Fe, aes(y=Value, x=Day, group = Parameter2, fill = Parameter2)) + 
    labs(fill = 'Parameter')