Question

Possible Duplicate:
How to change line and shape colours in ggplot2?

pdf('test',onefile=T)
    g <- ggplot(test,aes(x=timepoints,y= mean,ymax = mean + sde, ymin = mean  - sde,colour=Experiment)) + 
       geom_errorbar(width=2) + 
       geom_point() +
       geom_line() +
       xlab('Time (min)') +
       ylab('Fold Induction') +          
       opts(title = '5 min v 6 hr KCl treatment')    
    print(g)
dev.off()

this is what it prints.

how do I change the colour from the default to let’s say red and black? so ‘5 min’ is red and ‘6 hr’ is black?

Answer 1

Use scale_manual to manually define the scales:

g + scale_colour_manual(values = c("red", "black"))