r - Add horizontal lines, grouped by factor -


i have plot lines, grouped rank factor: 

ggplot(data=res.sum.df, aes(x=i_id, y=success_rate, colour = rank)) + geom_line(size=1.5, aes(group=rank))

enter image description here

i have additional data.frame object define mean value of values within each rank: 

> res.sum.df.mean source: local data frame [4 x 2]    rank mean_succes_rate 1    1       0.16666667 2    2       0.13735450 3    3       0.13628500 4    4       0.05797931

i add 4 vertical lines of yintercept these mean values, additionaly coloured (grouped) according existing line legend.

i tried adding aes argument , other things, combinations failed (lines not coloured):

  ggplot(data=res.sum.df, aes(x=i_id, y=success_rate, colour = rank)) +   geom_line(size=1.5, aes(group=rank)) +      geom_hline(yintercept = res.sum.df.mean$mean_succes_rate, aes(colour=rank))

enter image description here

you need specify intercepts in aesthetic mapping:

geom_hline(data = res.sum.df.mean,             aes(yintercept = mean_succes_rate, colour=rank))

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