How would you do it by hand / paper & pencil? Do you apply a certain algorithm? If so, that algorithm can then most probably be translated into a computer program.
in reply to Help with Matrix math!
A program should be light and agile, its subroutines connected like a string of pearls. The spirit and intent of the program should be retained throughout. There should be neither too little or too much, neither needless loops nor useless variables, neither lack of structure nor overwhelming rigidity." - The Tao of Programming, 4.1 - Geoffrey James