change both legend titles in a ggplot with two legends

问题

I have two legends on my ggplot with two different legend titles (automatically created from ggplot()). Now, I want to change this legend titles. + labs(colour = \"legend name\") only change the second legend title. How can I change the first one, too?

Sample data:

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\")

Here is my code to produce the plot:

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)

The legend titles are on default: \"factor(type)\" and \"code\": $\"enter$

回答1:

Here is an example using the iris dataset:

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")

You specify the labels using labs(), with each scale separately specified, i.e. labs(shape="Species label", colour="Petal width label").

回答2:

If I understood your point correctly, you can simply use + labs(shape = "shape legend title", colour = "colour legend title")

来源：https://stackoverflow.com/questions/6910988/change-both-legend-titles-in-a-ggplot-with-two-legends

标签

ggplot2

legend