p1<-ggplot(data = diamonds) +  geom_bar(mapping = aes(x = cut,fill=clarity))p2<-ggplot(data = diamonds) +  geom_bar(mapping = aes(x = cut, fill = clarity), position = "dodge")p3<-ggplot(data = diamonds) +  geom_bar(mapping = aes(x = cut))p4<-ggplot(data = iris,mapping = aes(x = Species, y = Sepal.Width, fill = Species)) +geom_boxplot()+  geom_jitter()p5<-ggplot(data = mpg, mapping = aes(x = class, y = hwy)) +   geom_boxplot() +  coord_flip()

p1+p2+p3+p4

p1|p2+p3 #p1占50%，p2和p3一共占50%

p1/p2/p3

(p1+p2)/p3 #可以把多个图合并成一行

p1+p2-p3+plot_layout(ncol = 1)  #p1和p2都在第一行，p3在第二行，一共一列，p1和p2看成一列

p1+p3-p2+plot_layout(ncol = 2) #效果和(p1+p3)|p2一样

p1+p2+p3+p4+p5+plot_layout(ncol = 2,heights = c(1,2,3)) #ncol设置两列，而且height是每行高度分别是1/2/3

p1+p2+(p3+p4+plot_layout(ncol = 2))+p5+plot_layout(widths = c(2,1))#p3和p4组合，并设置以两列方式组合，总体布局的宽度分别是2，1

(p1*theme_bw())+(p2+p3)+p4+plot_layout(ncol = 1)#对p1使用theme_bw() 主题，p3和p2合并成一张图，并且拼成一列

(p1+(p2+p3)+p4+plot_layout(ncol = 1))&theme_bw()

areas<-c(area(1,1,2,1),area(2,3,3,3))plot(areas)

layout<-c(area(1,1,1,1),area(1,3,3,3),area(3,1,3,2))plot(layout)

areas<-"A#B                 ##B             CCB"p1+p2+p3+plot_layout(design = areas)

p1+p2+p4+guide_area()+plot_layout(guides = "auto")#一共是四个区域p1,p2,p3和图例区

p1+p2+p4+guide_area()+plot_layout(guides = "collect")

p1+inset_element(p2,0.6,0.6,1,1)#图中的坐标同样表示插入图片的位置，(0.6,0.6)是图片的左下角点，(1,1)是图片右上角的点

p1+inset_element(p2,0,0.6,0.4,1)

p1+plot_spacer()+p2#在p1和p2之间插入一个空白

(p1|p2)/(p3|p4)+plot_annotation(tag_levels = "A")&theme(plot.tag=element_text(color="blue"，size=16))

(p1|p2)/(p3|p4)+plot_layout(tag_level = "new")+plot_annotation(tag_levels = list(c("A1","A2","A3","A4")))&theme(plot.tag = element_text(color = "grey",size = 16))