Color ggplot points based on defined color codes

Question

Is it possible to used ggplot to color points based on predefinded standard color codes contained in the data frame?

Below is some sample data and code to help articulat

Answer 1

The line you claimed didn't work:

df3$color.code.new <- ifelse(is.na(df3$color.codes), "#000000", df3$color.codes)

works for me, although I think you missed a digit in one of your hex colors. Once you have that straightened out, you just want to use scale_colour_manual with something like this:

tick  <- c("GE","APPL","GM","BTU","WMT","JPM","LUV")
price <- c(22,900,20,22,80,31,35)
volume<- c(300,500,100,107,400,300,325)
df1 <- data.frame(ticker=tick, price=price, volume=volume)

tick<-c("GE","APPL","GM","BTU","WMT")
ccodes<-c("#3399FF", "#FF0000", "#CC00FF", "#993300", "#66CC00")
cnames<-c("blue", "red", "purple", "brown", "green")
df2=data.frame(ticker=tick, color.codes=ccodes, color.names=cnames)

## merge color specifcations into data
df3 <-merge(df1,df2, by=("ticker"), all.x=TRUE, all.y=TRUE)
df3$color.code.new <- ifelse(is.na(df3$color.codes), "#000000", df3$color.codes) 

p <- ggplot(df3, aes(volume, price,colour = ticker))+ 
         geom_point() 
p + scale_colour_manual(breaks = df3$ticker,values = df3$color.code.new)