ggplot2 manually specifying color & linetype - duplicate legend

Question

I\'m creating a plot with multiple linetypes, colors, and filled regions.The code below produces two legends (one shows line types, the other shows line colors) - and I need

Answer 1

As said in the comment by @joran You need to create a variable state and bind it to color and linetype then ggplot do the rest for you. For example ,Here the plot s very simple since you put data in the right shape.

To manipulate data you need I advise you to learn plyr and reshape2 !

## I use your data 
## I melt my data 
library(reshape2)
measure.vars  <- colnames(dat)[c(1:12)][-c(1,3,5,10)]
mydata.melted <- melt(mydata, 
                      measure.vars= measure.vars, ## I don't use all the variables only
                                                                      States ones
                      id.vars='Dates')


states.list <- list('a','b','c','d','e','f','g','h')
names(states.list) <- measure.vars
mydata.melted$State <- NA
library(plyr)
mydata.melted <- ddply(mydata.melted,
                       .(variable),transform,
                       State=states.list[[unique(variable)]])
## I plot using the rights aes    

stochdefcolor = 'red'
stochoptcolor = 'green'
dtrmndefcolor = 'darkred'
dtrmnoptcolor = 'darkgreen'
library(ggplot2)
ggplot(subset(mydata.melted)) + 
  geom_line(aes(x=Dates,y=value,
                color=State,linetype=State))+
  scale_linetype_manual(values=c(1,1,1,1,2,3,2,3)) +  
  scale_size_manual(values =rep(c(1,0.7),each=4))+
  scale_color_manual(values=c(stochdefcolor,stochoptcolor,
                               dtrmndefcolor, dtrmnoptcolor,
                               stochdefcolor,stochdefcolor,
                               stochoptcolor,stochoptcolor))