如何在R ggplot2中绘制3个data.frames

如何解决如何在R ggplot2中绘制3个data.frames

我有3个数据帧：

head（df1）

  Row.names       Nmds1       Nmds2 Station
1     E01M1 -1.39917737 -0.52996467     S01
2     E01M2 -0.85390268 -0.24919481     S01
3     E01M3 -0.31713304  0.14375418     S01
4     E01M4 -0.54494214 -0.12534209     S01
5     E02M1  0.03874897 -0.10945807     S02
6     E02M2  0.68255493 -0.07708227     S02

head（df2）

              Nmds1      Nmds2 env.pvals env.variables
Deep      0.23990125 -0.3194394 0.5384615          Deep
Salinity -0.18454375 -0.1849230 1.0000000      Salinity
Temp     -0.02935085  0.1953837 1.0000000          Temp
OD        0.27043891 -0.3425079 0.2967033            OD
pH        0.34483843 -0.1953211 0.6043956            pH
DBO5     -0.31011556  0.1377326 1.0000000          DBO5

head（df3）

               Nmds1      Nmds2 spp_pvals             Family
Otu_3503 -0.13102909  0.5044264     0.009 Desulfobacteraceae
Otu_3887 -0.09181908  0.5502878     0.004 Desulfobacteraceae
Otu_4287 -0.08140270  0.3914792     0.031 Desulfobacteraceae
Otu_4804 -0.10993229  0.5427913     0.005 Desulfobacteraceae
Otu_4807  0.21147428 -0.1891993     0.198   Desulfobulbaceae
Otu_5108 -0.45920996  0.0493874     0.012     Desulfatiglans

我试图从三个df，df2和df3中绘制一个图

绘制df1

P <- ggplot(df1,aes(x = Nmds1,y = Nmds2)) + geom_point(aes(Nmds1,Nmds2,color = Station),size=4) + theme_bw()

绘制df1 + df2

P <- P + geom_segment(data = df2,aes(x = 0,xend = Nmds1,y = 0,yend = Nmds2),arrow = arrow(length = unit(0.25,"cm")),colour = "grey10",lwd = 0.3) + 
    ggrepel::geom_text_repel(data = df2,y = Nmds2,label = env.variables),cex = 4,direction = "both",segment.size = 0.25)

问题！

我想使用geom_point将df3图添加到先前的P图中

ggplot(df3,color = Family),size=2,shape=20,alpha=0.4) + theme_bw()

我必须调整比例吗？如何在一个绘图中绘制所有3个df ???

谢谢

解决方法

实际上，您的问题是，对于两个不同的点集，您需要两个色标。

有解决此问题的方法，涉及到诸如ggnewscale之类的其他程序包，但在此情况下，更简单的方法是使用具有填充颜色的形状来代表较大的点。 shape = 21非常适合您的大积分。这样，您可以将填充比例用于Station，将颜色比例用于Family。请记住，如果要更改较大点的颜色，则需要使用scale_fill_xxx而不是scale_color_xxx

library(ggplot2)
library(ggrepel)

ggplot(df1,aes(x = NMDS1,y = NMDS2)) + 
  geom_point(aes(fill = Station),size = 5,shape = 21,color = "00000000") + 
  geom_segment(aes(x = 0,xend = NMDS1,y = 0,yend = NMDS2),data = df2,arrow = arrow(length = unit(0.25,"cm")),colour = "grey10",lwd = 0.3) +
  geom_text_repel(aes(label = env.variables),cex = 4,direction = "both",segment.size = 0.25) +
  geom_point(aes(color = Family),data = df3,size = 2,shape = 20) +
  theme_bw()