Hello All,

 

I am trying to create a legend for a black-white graph. The package I
use is ggplot2. It can add colors to the legend key but not line types.
Can you please help?

 

# example from Wickman (2009, ggplot2 - elegant graphics for data
analysis, page 109)

 

library(ggplot2)

huron <- data.frame(year=1875:1972, level=LakeHuron)

ggplot(huron, aes(year)) +

    geom_line(aes(y=level+5, colour="above")) +

    geom_line(aes(y=level-5, colour="below")) +

    scale_colour_manual("Direction", c("above"="black",
"below"="black"))

 

Thanks,

 

 

Edwin

 

Changyou Sun, Ph.D.

Associate Professor

Natural Resource Policy & Economics

Box 9681, Department of Forestry

Mississippi State University

Mississippi State, MS 39762

 

#363 Thompson Hall

(662) 325 7271 (ph), 325 8726 (fax)

csun@cfr.msstate.edu

www.cfr.msstate.edu/forestry

 


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