使用两个图例更改ggplot中的两个图例标题

Question

我的ggplot上有两个传说,有两个不同的图例标题(自动创建ggplot()).现在,我想改变这个传奇的标题. + labs(colour = "legend name")只更改第二个图例标题.我怎么能改变第一个呢？

样本数据:

dataset <- structure(list(date = structure(c(1264572000, 1266202800, 1277362800), 
class = c("POSIXt", "POSIXct"), tzone = ""), 
x1 = c(-0.00183760994446658, 0.00089738603087497, 0.000423513598318936), 
x2 = c("approach x","approach y","approach z"), 
x3 = c("Type1", "Type1", "Type2")) ,
.Names = c("date", "data","code","type"),
row.names = c("1", "2", "3"), class = "data.frame")

这是我制作情节的代码:

p <- ggplot(dataset, aes(x=date, y=data)) +
geom_point(aes(shape = factor(type), color = code)) +
scale_shape_manual(value=c(23,15))
print(p)

图例标题默认为:"factor(type)"和"code":

Answer 1

以下是使用iris数据集的示例:

data(iris)
ggplot(iris, aes(x=Sepal.Length, y=Sepal.Width)) +
    geom_point(aes(shape=Species, colour=Petal.Width)) + 
    scale_colour_gradient() +
    labs(shape="Species label", colour="Petal width label")

您可以使用指定标签labs(),每个刻度单独指定,即labs(shape="Species label", colour="Petal width label").

Answer 2

如果我理解你的观点,你可以简单地使用 + labs(shape = "shape legend title", colour = "colour legend title")