关于r:为复杂的图构建手动图例

Construct a manual legend for a complicated plot

我无法弄清楚如何为此图手动设置图例。我真正想要的只是一个简单的图例,该图例使用三种颜色并在每种颜色旁边都有一个名称。

enter

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a <-c("S1","S2","S3","S4","S5","S6","S7","S8","S9") #names
b <-c(0.23,0.26,0.55,0.56,0.36,0.23,0.18,0.06,0.04) #mean t0
c <-c(0.64,0.6,0.81,1.4,0.89,0.55,0.48,0.22,0.09) #mean t1
d <-c(0.20,0.23,0.52,0.53,0.33,0.20,0.15,0.04,0.03) #SD low t0
e <-c(0.26,0.29,0.58,.59,0.39,0.26,0.21,0.08,0.05) #SD high t0
f <-c(0.67,0.63,0.86,1.44,0.93,0.59,0.51,0.25,0.10) #SD high t1
g <-c(0.61,0.57,0.78,1.36,0.85,0.53,0.45,0.19,0.08) #SD low t1
h <-c(0.41,0.34,0.26,0.84,0.53,0.32,0.30,0.16,0.05) #absolute change

data <- data.frame(a,b,c,d,e,f,g,h)

ggplot(data=data,aes(a)) +
  geom_bar(stat="identity", aes(y=h),fill="#62c76b",colour="#333333")+ #green
  geom_line(aes(y=b,group=1),size=1.0,colour="#f04546") +   #red
  geom_point(aes(y=b),size=3, colour="#f04546") +           #red
  geom_errorbar(aes(ymin=d, ymax=e), colour="#f04546", width=0.1, size=.8) +
  geom_line(aes(y=c,group=1),size=1.0,colour="#3591d1") +   #blue
  geom_point(aes(y=c),size=3, colour="#3591d1") +           #blue
  geom_errorbar(aes(ymin=f, ymax=g), colour="#3591d1", width=0.1, size=.8) +
  ylab("Symptom severity") + xlab("PHQ-9 symptoms") +
  ylim(0,1.6) +
  theme_bw() +
  theme(axis.title.x = element_text(size = 15, vjust=-.2)) +
  theme(axis.title.y = element_text(size = 15, vjust=0.3))


您需要将属性映射到美学(es语句中的颜色)以生成图例。

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cols <- c("LINE1"="#f04546","LINE2"="#3591d1","BAR"="#62c76b")
ggplot(data=data,aes(x=a)) +
  geom_bar(stat="identity", aes(y=h, fill ="BAR"),colour="#333333")+ #green
  geom_line(aes(y=b,group=1, colour="LINE1"),size=1.0) +   #red
  geom_point(aes(y=b, colour="LINE1"),size=3) +           #red
  geom_errorbar(aes(ymin=d, ymax=e, colour="LINE1"), width=0.1, size=.8) +
  geom_line(aes(y=c,group=1,colour="LINE2"),size=1.0) +   #blue
  geom_point(aes(y=c,colour="LINE2"),size=3) +           #blue
  geom_errorbar(aes(ymin=f, ymax=g,colour="LINE2"), width=0.1, size=.8) +
  scale_colour_manual(name="Error Bars",values=cols) + scale_fill_manual(name="Bar",values=cols) +
  ylab("Symptom severity") + xlab("PHQ-9 symptoms") +
  ylim(0,1.6) +
  theme_bw() +
  theme(axis.title.x = element_text(size = 15, vjust=-.2)) +
  theme(axis.title.y = element_text(size = 15, vjust=0.3))

enter。要合并不同的图例,通常需要对所有元素进行一致的映射,但是当前它为我生成了黑色背景的伪像。我以为guide = guide_legend(fill = NULL,colour = NULL)会将图例的背景设置为null,但事实并非如此。也许值得另一个问题。

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ggplot(data=data,aes(x=a)) +
  geom_bar(stat="identity", aes(y=h,fill ="BAR", colour="BAR"))+ #green
  geom_line(aes(y=b,group=1, colour="LINE1"),size=1.0) +   #red
  geom_point(aes(y=b, colour="LINE1", fill="LINE1"),size=3) +           #red
  geom_errorbar(aes(ymin=d, ymax=e, colour="LINE1"), width=0.1, size=.8) +
  geom_line(aes(y=c,group=1,colour="LINE2"),size=1.0) +   #blue
  geom_point(aes(y=c,colour="LINE2", fill="LINE2"),size=3) +           #blue
  geom_errorbar(aes(ymin=f, ymax=g,colour="LINE2"), width=0.1, size=.8) +
  scale_colour_manual(name="Error Bars",values=cols, guide = guide_legend(fill = NULL,colour = NULL)) +
  scale_fill_manual(name="Bar",values=cols, guide="none") +
  ylab("Symptom severity") + xlab("PHQ-9 symptoms") +
  ylim(0,1.6) +
  theme_bw() +
  theme(axis.title.x = element_text(size = 15, vjust=-.2)) +
  theme(axis.title.y = element_text(size = 15, vjust=0.3))

enter

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ggplot(data=data,aes(x=a)) +
  geom_bar(stat="identity", aes(y=h,fill ="BAR", colour="BAR"))+ #green
  geom_line(aes(y=b,group=1, colour="LINE1"),size=1.0) +   #red
  geom_point(aes(y=b, colour="LINE1", fill="LINE1"),size=3) +           #red
  geom_errorbar(aes(ymin=d, ymax=e, colour="LINE1"), width=0.1, size=.8) +
  geom_line(aes(y=c,group=1,colour="LINE2"),size=1.0) +   #blue
  geom_point(aes(y=c,colour="LINE2", fill="LINE2"),size=3) +           #blue
  geom_errorbar(aes(ymin=f, ymax=g,colour="LINE2"), width=0.1, size=.8) +
  scale_colour_manual(name="Error Bars",values=cols,
                      guide = guide_legend(override.aes=aes(fill=NA))) +
  scale_fill_manual(name="Bar",values=cols, guide="none") +
  ylab("Symptom severity") + xlab("PHQ-9 symptoms") +
  ylim(0,1.6) +
  theme_bw() +
  theme(axis.title.x = element_text(size = 15, vjust=-.2)) +
  theme(axis.title.y = element_text(size = 15, vjust=0.3))

enter


如果您正在努力更改linetypes,以下答案应该会有所帮助。 (这是Andy W.解决方案的补充)。

我们将尝试扩展学习的模式:

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cols <- c("LINE1"="#f04546","LINE2"="#3591d1","BAR"="#62c76b")
line_types <- c("LINE1"=1,"LINE2"=3)
ggplot(data=data,aes(x=a)) +
  geom_bar(stat="identity", aes(y=h,fill ="BAR"))+ #green
  geom_line(aes(y=b,group=1, colour="LINE1", linetype="LINE1"),size=0.5) +   #red
  geom_point(aes(y=b, colour="LINE1", fill="LINE1"),size=2) +           #red
  geom_line(aes(y=c,group=1,colour="LINE2", linetype="LINE2"),size=0.5) +   #blue
  geom_point(aes(y=c,colour="LINE2", fill="LINE2"),size=2) +           #blue
  scale_colour_manual(name="Error Bars",values=cols,
                  guide = guide_legend(override.aes=aes(fill=NA))) +
  scale_linetype_manual(values=line_types)+
  scale_fill_manual(name="Bar",values=cols, guide="none") +
  ylab("Symptom severity") + xlab("PHQ-9 symptoms") +
  ylim(0,1.6) +
  theme_bw() +
  theme(axis.title.x = element_text(size = 15, vjust=-.2)) +
  theme(axis.title.y = element_text(size = 15, vjust=0.3))

但是,我们得到的是以下结果:
manual

问题是linetype没有在主图例中合并。
注意,我们没有给方法scale_linetype_manual命名。
此处起作用的技巧是为它命名与命名scale_colour_manual的名称相同。
更具体地说,如果将相应的行更改为以下内容,则会得到所需的结果:

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scale_linetype_manual(name="Error Bars",values=line_types)

manual

现在,以相同的想法很容易更改行的大小。

请注意,geom_bar不再具有color属性。 (我没有尝试解决此问题。)此外,添加带有color属性的geom_errorbar会破坏结果。如果有人能提出一个更好的解决方案,同时解决这两个问题,那就太好了。