Mmm no really need in fact, it's easy with layer(). However I don't find how to control the color of a layer ?
Le mardi 10 juin 2014 11:00:04 UTC+2, Stéphane Laurent a écrit : > > Hello is there something in Gadfly like the geom_abline() function in the > ggplot2 R package to add a single line to an existing plot ? >
