ggplot2 - R - ggplot change points color -
i using ggplot draw map of , dots on it. code , image drawn.
ggplot()+ geom_polygon( data=all_states, aes(x=long, y=lat, group = group), colour="white")+ geom_point(aes(x = locations$lon, y = locations$lat, size = locations$num, color=locations$salary), show.legend = true)) my problem is: color of dots blue default. how can set different degrees of yellow according locations$salary. in addition, want darker yellow higher salary, not reverse. thanks.

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