Multiple graphs on one page (ggplot2)

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Problem

You want to put multiple graphs on one page.

1. library(ggplot2)
   
2. 
   
3. # This example uses the ChickWeight dataset, which comes with ggplot2
   
4. # First plot
   
5. p1 <-
   
6.     ggplot(ChickWeight, aes(x=Time, y=weight, colour=Diet, group=Chick)) +
   
7.     geom_line() +
   
8.     ggtitle("Growth curve for individual chicks")
   
9. 
   
10. # Second plot
    
11. p2 <-
    
12.     ggplot(ChickWeight, aes(x=Time, y=weight, colour=Diet)) +
    
13.     geom_point(alpha=.3) +
    
14.     geom_smooth(alpha=.2, size=1) +
    
15.     ggtitle("Fitted growth curve per diet")
    
16. 
    
17. # Third plot
    
18. p3 <-
    
19.     ggplot(subset(ChickWeight, Time==21), aes(x=weight, colour=Diet)) +
    
20.     geom_density() +
    
21.     ggtitle("Final weight, by diet")
    
22. 
    
23. # Fourth plot
    
24. p4 <-
    
25.     ggplot(subset(ChickWeight, Time==21), aes(x=weight, fill=Diet)) +
    
26.     geom_histogram(colour="black", binwidth=50) +
    
27.     facet_grid(Diet ~ .) +
    
28.     ggtitle("Final weight, by diet") +
    
29.     theme(legend.position="none")        # No legend (redundant in this graph)   

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Once the plot objects are set up, we can render them with multiplot. This will make two columns of graphs:

1. ultiplot(p1, p2, p3, p4, cols=2)

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multiplot function

1. # Multiple plot function
   
2. #
   
3. # ggplot objects can be passed in ..., or to plotlist (as a list of ggplot objects)
   
4. # - cols:   Number of columns in layout
   
5. # - layout: A matrix specifying the layout. If present, 'cols' is ignored.
   
6. #
   
7. # If the layout is something like matrix(c(1,2,3,3), nrow=2, byrow=TRUE),
   
8. # then plot 1 will go in the upper left, 2 will go in the upper right, and
   
9. # 3 will go all the way across the bottom.
   
10. #
    
11. multiplot <- function(..., plotlist=NULL, file, cols=1, layout=NULL) {
    
12.   require(grid)
    
13. 
    
14.   # Make a list from the ... arguments and plotlist
    
15.   plots <- c(list(...), plotlist)
    
16. 
    
17.   numPlots = length(plots)
    
18. 
    
19.   # If layout is NULL, then use 'cols' to determine layout
    
20.   if (is.null(layout)) {
    
21.     # Make the panel
    
22.     # ncol: Number of columns of plots
    
23.     # nrow: Number of rows needed, calculated from # of cols
    
24.     layout <- matrix(seq(1, cols * ceiling(numPlots/cols)),
    
25.                     ncol = cols, nrow = ceiling(numPlots/cols))
    
26.   }
    
27. 
    
28. if (numPlots==1) {
    
29.     print(plots[[1]])
    
30. 
    
31.   } else {
    
32.     # Set up the page
    
33.     grid.newpage()
    
34.     pushViewport(viewport(layout = grid.layout(nrow(layout), ncol(layout))))
    
35. 
    
36.     # Make each plot, in the correct location
    
37.     for (i in 1:numPlots) {
    
38.       # Get the i,j matrix positions of the regions that contain this subplot
    
39.       matchidx <- as.data.frame(which(layout == i, arr.ind = TRUE))
    
40. 
    
41.       print(plots[[i]], vp = viewport(layout.pos.row = matchidx$row,
    
42.                                       layout.pos.col = matchidx$col))
    
43.     }
    
44.   }
    
45. }

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关键词：Multiple ggplot2 multip Graphs gplot one function recently multiple

非常实用的函数，谢谢LZ分享！