r - Two geom_points add a legend -


i plot 2 geom_point graph following code:

source("http://www.openintro.org/stat/data/arbuthnot.r") library(ggplot2) ggplot() +   geom_point(aes(x = year,y = boys),data=arbuthnot,colour = '#3399ff') +   geom_point(aes(x = year,y = girls),data=arbuthnot,shape = 17,colour = '#ff00ff') +   xlab(label = 'year') +   ylab(label = 'rate')

i want know how add legend on right side. same shape , color. triangle pink should have legend "woman" , blue circle legend "men". seems quite simple after many trial not it. (i'm beginner ggplot).

enter image description here

if rename columns of original data frame , melt long format withreshape2::melt, it's easier handle in ggplot2. specifying color , shape aesthetics in ggplot command, , specifying scales colors , shapes manually, legend appear. 

source("http://www.openintro.org/stat/data/arbuthnot.r") library(ggplot2) library(reshape2)  names(arbuthnot) <- c("year", "men", "women")  arbuthnot.melt <- melt(arbuthnot, id.vars = 'year', variable.name = 'sex',      value.name = 'rate')  ggplot(arbuthnot.melt, aes(x = year, y = rate, shape = sex, color = sex))+ geom_point() + scale_color_manual(values = c("women" = '#ff00ff','men' = '#3399ff')) +  scale_shape_manual(values = c('women' = 17, 'men' = 16))

enter image description here


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