ggplot2: Change color for each facet in bar chart

Question

I have a faceted bar chart done with ggplot2 with this code:

ggplot(data_long, aes(x=region, y=wert)) + 
geom_bar(aes(fill = kat ), position = \"dodge\", width=.         


        

Answer 1

Based on the answer @alexwhan, I could manually set the colors using this code:

  farb <- c("#428953", "#CE2929", "#A3DD57", "#77E599", "#5675D6", "#65ECEF", "#FF8B07", "#D0B100", "#636363")

  ggplot(data_long, aes(region, wert)) +
  geom_bar(aes(fill = type, alpha = factor(kat)), position = "dodge", stat = "identity") + 
  scale_alpha_manual(values = c(0.6, 1)) +
  facet_grid(. ~ type) +
  theme_bw() + theme( strip.background  = element_blank(),
                      panel.grid.major = element_line(colour = "grey80"),
                      panel.border = element_blank(),
                      axis.ticks = element_blank(),
                      panel.grid.minor.x=element_blank(),
                      panel.grid.major.x=element_blank() ) +
  theme(legend.position="bottom") +
  scale_fill_manual(values= farb)

The color scale farbhas to be in the same order as the facets. Produces this chart: