R ggplot2连接点不是由x轴而是由因子连接

Question

我有从vegan metaMDS中提取的data.frame，如下所示：

    MDS1         MDS2 time nucleic_acid habitat treatment
10dnawatercontrol  0.06297458  0.153364604   10          dna   water   control
10dnawatertreated   -0.20010385 -0.241614081   10          dna   water     treated
11dnawatercontrol  0.15518683  0.067861388   11          dna   water   control
11dnawatertreated   -0.12137470 -0.258434255   11          dna   water     treated
12dnawatercontrol -0.02041011  0.140458063   12          dna   water   control
12dnawatertreated   -0.36101682 -0.110667764   12          dna   water     treated
13dnawatercontrol -0.19054474  0.287597321   13          dna   water   control
13dnawatertreated   -0.26751484 -0.092326331   13          dna   water     treated
14dnawatercontrol -0.10942501  0.208263588   14          dna   water   control
14dnawatertreated   -0.33594573  0.015625565   14          dna   water     treated
15dnawatercontrol -0.06631137  0.226240078   15          dna   water   control
15dnawatertreated   -0.27606083 -0.019999889   15          dna   water     treated
16dnawatercontrol  0.01703248  0.132900239   16          dna   water   control
16dnawatertreated   -0.32565421 -0.022154859   16          dna   water     treated
17dnawatercontrol -0.25806806  0.201731201   17          dna   water   control
17dnawatertreated   -0.40662186 -0.003830044   17          dna   water     treated
18dnawatercontrol -0.17699110  0.184587876   18          dna   water   control
18dnawatertreated   -0.46597548 -0.022633769   18          dna   water     treated
19dnawatercontrol -0.28119311  0.197837800   19          dna   water   control
19dnawatertreated   -0.62468238  0.187704606   19          dna   water     treated
4dnawatercontrol   1.23658067  0.660553669    4          dna   water   control
4dnawatertreated     0.85195731 -0.740790358    4          dna   water     treated
5dnawatercontrol   0.66159385  0.183955243    5          dna   water   control
5dnawatertreated     0.36367763 -0.446656965    5          dna   water     treated
6dnawatercontrol   0.19736034  0.206992740    6          dna   water   control
6dnawatertreated    -0.04189317 -0.273487207    6          dna   water     treated
7dnawatercontrol   0.35362061 -0.005658852    7          dna   water   control
7dnawatertreated     0.14481323 -0.409432041    7          dna   water     treated
8dnawatercontrol   0.30718548  0.072991390    8          dna   water   control
8dnawatertreated     0.13210812 -0.311147579    8          dna   water     treated
9dnawatercontrol   0.20028730  0.065109821    9          dna   water   control
9dnawatertreated    -0.15459106 -0.234941197    9          dna   water     treated

我正在用ggplot2绘制这些数据：

ggplot()+ 
geom_point(data=meta_nmds_water_dna,aes(x=MDS1,y=MDS2,shape=treatment,colour=time),size=3)+
geom_line(data=meta_nmds_water_dna,aes(x=MDS1,y=MDS2,group=treatment,colour=time),size=1)+
geom_text(data=meta_nmds_water_dna,aes(x=MDS1,y=MDS2,label=time,size=6,vjust=0)) 

正如您所看到的，geom_points是根据x值连接的，但我希望通过＆＃34; time＆＃34; -factor连接它们，您知道这样做的方法吗？

Answer 1

啊完美的本，谢谢你推动我朝着正确的方向前进！用：

ggplot() + 
  geom_point(data=meta_nmds_water_dna,aes(x=MDS1,y=MDS2,shape=treatment,colour=time),size=4) +
  geom_path(data=path,aes(x=MDS1,y=MDS2,group=treatment,colour=as.numeric(as.character(time))),size=1.5)+
  geom_text(data=meta_nmds_water_dna,aes(x=MDS1,y=MDS2,label=time,size=5,vjust=-0.7)) +
  coord_equal()

我完全得到了我想要的东西。但请确保您的数据顺序正确：

path<-meta_nmds_water_dna
path$time<-as.numeric(as.character(path$time))
path<-path[order(path$time),]