r - How to add legend to ggplot2 line chart? -

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i have simple dataframe:

> ih   year    y1    y2 1 2005  4.50  4.92 2 2006  4.89  6.21 3 2007  6.63  6.68 4 2008  4.89  4.60 5 2009 16.56 15.16 6 2010 17.98 17.73 7 2011 25.92 19.85

and graph line chart year on x-axis , y1 , y2 2 separate lines, both black , different line types. how can legend shows y1 represents "bob" , y2 represents "susan"?

here attempt, produces following graph (without legend):

ggplot(ih, aes(x = year)) + geom_line(aes(y=y1), linetype="dashed") +    geom_line(aes(y=y2)) +    labs(x="year", y="percentage", fill="data") +    geom_point(aes(y=y1)) +    geom_point(aes(y=y2))

enter image description here

thank help! today first day using r!

you should convert data long format example function melt() library reshape2 , use variable define linetype= in aes(). legend made automatically. remove name variable in legend can add scale_linetype(""). 

library(reshape2) ih.long<-melt(ih, id.vars="year")  ih.long    year variable value 1  2005       y1  4.50 2  2006       y1  4.89 3  2007       y1  6.63 4  2008       y1  4.89 5  2009       y1 16.56 6  2010       y1 17.98 ....  ggplot(ih.long,aes(year,value,linetype=variable))+geom_line()+geom_point()+     scale_linetype("")

enter image description here


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