希望有人能够帮助我解决一个ggplot脚本的问题。我想创建一个折线图，并在右边栏中为每条线添加标签。由于该脚本将多次使用，因此需要相对灵活地处理不同的数据。目前已经基本满足我的要求，但是我遇到了一个未能解决的问题。
这个脚本可以绘制分面图或非分面图的折线图。我遇到的问题是，在右边的标签区域中，如果随着时间的推移没有显著变化，则应将其颜色编码为黑色；如果有积极的变化，则为绿色；如果有消极的变化，则为红色。 当我只有一个分面时，我已经有了一个可行的脚本来实现这一点，但是一旦在图表中有多个分面，标签的颜色编码会出现以下错误。
Error: Incompatible lengths for set aesthetics:
以下是带有多个方面数据的脚本。问题似乎在于我在geom_text行中指定颜色的方式。如果我删除脚本中geom_text行中的color调用，则可以在正确的位置打印属性，但没有颜色。我真的很困惑。这是我在这里的第一篇帖子，如果我在帖子中做错了什么，请告诉我。
require(ggplot2)
require(grid)
require(zoo)
require(reshape)
require(reshape2)
require(directlabels)
time.data<-structure(list(Attribute = structure(c(1L, 1L, 2L, 2L, 3L, 3L,
4L, 4L, 5L, 5L, 6L, 6L), .Label = c("Taste 1", "Taste 2", "Taste 3",
"Use 1", "Use 2", "Use 3"), class = "factor"), Attribute.Category = structure(c(2L,
2L, 2L, 2L, 2L, 2L, 1L, 1L, 1L, 1L, 1L, 1L), .Label = c("Nutritional/Usage",
"Taste/Quality"), class = "factor"), Attribute.Order = c(1L,
1L, 2L, 2L, 3L, 3L, 4L, 4L, 5L, 5L, 6L, 6L), Category.Order = c(1L,
1L, 1L, 1L, 1L, 1L, 2L, 2L, 2L, 2L, 2L, 2L), Color = structure(c(1L,
1L, 2L, 2L, 3L, 3L, 4L, 4L, 5L, 5L, 6L, 6L), .Label = c("#084594",
"#2171B5", "#4292C6", "#6A51A3", "#807DBA", "#9E9AC8"), class = "factor"),
value = c(75L, 78L, 90L, 95L, 82L, 80L, 43L, 40L, 25L, 31L,
84L, 84L), Date2 = structure(c(2L, 1L, 2L, 1L, 2L, 1L, 2L,
1L, 2L, 1L, 2L, 1L), .Label = c("1/1/2013", "9/1/2012"), class = "factor")), .Names = c("Attribute",
"Attribute.Category", "Attribute.Order", "Category.Order", "Color",
"value", "Date2"), class = "data.frame", row.names = c(NA, -12L
))
label.data<-structure(list(7:12, Attribute = structure(1:6, .Label = c("Taste 1",
"Taste 2", "Taste 3", "Use 1", "Use 2", "Use 3"), class = "factor"),
Attribute.Category = structure(c(2L, 2L, 2L, 1L, 1L, 1L), .Label = c("Nutritional/Usage",
"Taste/Quality"), class = "factor"), Attribute.Order = 1:6,
Category.Order = c(1L, 1L, 1L, 2L, 2L, 2L), Color = structure(1:6, .Label = c("#084594",
"#2171B5", "#4292C6", "#6A51A3", "#807DBA", "#9E9AC8"), class = "factor"),
Significance = structure(c(2L, 3L, 1L, 1L, 3L, 2L), .Label = c("neg",
"neu", "pos"), class = "factor"), variable = structure(c(1L,
1L, 1L, 1L, 1L, 1L), .Label = "1/1/2013", class = "factor"),
value = c(78L, 95L, 80L, 40L, 31L, 84L), Date2 = structure(c(1L,
1L, 1L, 1L, 1L, 1L), .Label = "2013-01-01", class = "factor"),
label.color = structure(c(1L, 2L, 3L, 3L, 2L, 1L), .Label = c("black",
"forestgreen", "red"), class = "factor")), .Names = c("",
"Attribute", "Attribute.Category", "Attribute.Order", "Category.Order",
"Color", "Significance", "variable", "value", "Date2", "label.color"
), class = "data.frame", row.names = c(NA, -6L))
color.palette<-as.character(unique(time.data$Color))
time.data$Date2<-as.Date(time.data$Date2,format="%m/%d/%Y")
plot<-ggplot()+
geom_line(data=time.data,aes(as.numeric(time.data$Date2),time.data$value,group=time.data$Attribute,color=time.data$Color),size=1)+
geom_text(data=label.data,aes(x=Inf, y=label.data$value, label=paste(" ",label.data$Attribute)),
color=label.data$label.color,
size=4,vjust=0, hjust=0,na.rm=T)+
facet_grid(Attribute.Category~.,space="free")+
theme_bw()+
scale_x_continuous(breaks=as.numeric(unique(time.data$Date2)),labels=format(unique(time.data$Date2),format = "%b %Y"))+
theme(strip.background=element_blank(),
strip.text.y=element_blank(),
legend.text=element_blank(),
legend.title=element_blank(),
plot.margin=unit(c(1,5,1,1),"cm"),
legend.position="none")+
scale_colour_manual(values=color.palette)
gt3 <- ggplot_gtable(ggplot_build(plot))
gt3$layout$clip[gt3$layout$name == "panel"] <- "off"
grid.draw(gt3)
plot.start和plot.end提供值，因为它们目前未定义。 - SlowLearnertime.data和label.data），因此一种方法是创建2个类似的数据框，仅使用3-4个日期作为x轴，3个Attribute而不是10个（像High，Low，Med这样的短文本！），2个Attribute.Category。此外，对于此示例，您真的需要Significance，variable和其他列吗？如果不需要，请删除所有这些内容。删除major.line.color，ymin和其他声明-与问题无关。最后，省略theme()部分：这只是您稍后可以添加的外观调整。祝你好运！ - SlowLearner