Using a pre-defined color palette in ggplot

Question

Does anyone know how to use a pre-defined color palette in ggplot?

I have a vector of colors I would like to use:

rhg_cols <- c("#771C19", "#AA3929", "#E25033", "#F27314", "#F8A31B",                "#E2C59F", "#B6C5CC", "#8E9CA3", "#556670", "#000000") 

But when I try to pass it to nothing happened

ggplot(mydata, aes(factor(phone_partner_products)), color = rhg_cols) +   geom_bar() 

Answer 1

You must put colour = rhg_cols inside aes(). As far as I can tell, you want to apply gradient to bars (in barplot) with factor variable on the abscissa? Then use fill - try this instead:

ggplot(mydata, aes(factor(phone_partner_products), fill = factor(phone_partner_products))) +   geom_bar() +    scale_fill_manual(values = rhg_cols) 

or try to achieve approximate replica with:

ggplot(mydata, aes(factor(phone_partner_products), fill = phone_partner_products))) +   geom_bar() +    scale_fill_gradient(low = "#771C19", high = "#000000") 

Notice that in second case a continuous variable is passed to fill aesthetics, therefore scale_fill_gradient is passed afterwards. If you pass a factor to the fill aes, you must stick with scale_fill_manual(values = rhg_cols).

Answer 2

If the colours are a palette, use scale_colour_manual:

ggplot(mydata, aes(factor(phone_partner_products), colour = colour_variable)) +   scale_colour_manual(values = rhg_cols)