Assign Random Colors to Unique Items in a Vector
Description
The as.color function takes an R vector of any class as an input,
and outputs a vector of unique hexadecimal color values that correspond to the
unique input values. This is most handy when overlaying points and lines for
data that correspond to different levels or factors. The function will also
print the random seed used to generate the colors. If you like the color palette
generated, you can save the seed and reuse those colors.