R語言之可視化③點圖續

修改圖例legend位置

p + theme(legend.position="top")
p + theme(legend.position="bottom")
p + theme(legend.position="none") # Remove legend

更改圖例中項目的順序

函數scale_x_discrete可用於將項目的順序更改爲“2”，“0.5”，“1”：

p + scale_x_discrete(limits=c("2", "0.5", "1"))

具有多個組的點圖

# Change dot plot colors by groups
ggplot(ToothGrowth, aes(x=dose, y=len, fill=supp)) +
  geom_dotplot(binaxis='y', stackdir='center')
# Change the position : interval between dot plot of the same group
p<-ggplot(ToothGrowth, aes(x=dose, y=len, fill=supp)) +
  geom_dotplot(binaxis='y', stackdir='center', 
               position=position_dodge(0.8))
p

更改點圖顏色並添加框圖：

# Change colors
p+scale_fill_manual(values=c("#999999", "#E69F00", "#56B4E9"))
# Add box plots
ggplot(ToothGrowth, aes(x=dose, y=len, fill=supp)) +
  geom_boxplot(fill="white")+
  geom_dotplot(binaxis='y', stackdir='center')
# Change the position
ggplot(ToothGrowth, aes(x=dose, y=len, fill=supp)) +
  geom_boxplot(position=position_dodge(0.8))+
  geom_dotplot(binaxis='y', stackdir='center', 
               position=position_dodge(0.8))

修改顏色和主題

# Basic dot plot
ggplot(ToothGrowth, aes(x=dose, y=len)) + 
  geom_boxplot()+
  geom_dotplot(binaxis='y', stackdir='center')+
  labs(title="Plot of length  by dose",x="Dose (mg)", y = "Length")+
  theme_classic()
# Change color by groups
dp <-ggplot(ToothGrowth, aes(x=dose, y=len, fill=dose)) + 
  geom_dotplot(binaxis='y', stackdir='center')+
  labs(title="Plot of length  by dose",x="Dose (mg)", y = "Length")
dp + theme_classic()

手動更改填充顏色：

# Continuous colors
dp + scale_fill_brewer(palette="Blues") + theme_classic()
# Discrete colors
dp + scale_fill_brewer(palette="Dark2") + theme_minimal()
# Gradient colors
dp + scale_fill_brewer(palette="RdBu") + theme_minimal()