r - adding another dimension/variable to a ggplot2 dotplot -

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this should easy driving me crazy.

i have data of form:

categories, retailcpc, advertisercpc
flowers, 0.2, 0.25
shoes, 0.4, 0.1

i trying show dotplot 2 dots per row , ordered retailcpc using ggplot2.

i able graph 1 dimension (by mean retailcpc data) so:

mydf$categories <- reorder(mydf$categories, mydf$retailcpc) require(ggplot2)  p1 <- qplot(retailcpc, categories, data = mydf) p1 + geom_point(colour = "red", size = 2)

how can add advertisercpc dots?

do mean this:

ggplot(melt(mydf), aes(value, categories, colour=variable)) + geom_point()

note ggplot has high affinity "long" format "wide" format, , melt helps convert "wide" "long" format.


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