# ---------------------------------------------------------------------------
# - 0109.als                                                                -
# - afnix example : chapter 1 : example 09                                  -
# ---------------------------------------------------------------------------
# - This program is free software;  you can redistribute it  and/or  modify -
# - it provided that this copyright notice is kept intact.                  -
# -                                                                         -
# - This program  is  distributed in  the hope  that it will be useful, but -
# - without  any  warranty;  without  even   the   implied    warranty   of -
# - merchantability or fitness for a particular purpose.  In no event shall -
# - the copyright holder be liable for any  direct, indirect, incidental or -
# - special damages arising in any way out of the use of this software.     -
# ---------------------------------------------------------------------------
# - copyright (c) 1999-2007 amaury darsch                                   -
# ---------------------------------------------------------------------------

# compute the scalar product of two vectors

const scalar-product (u v) {
  trans result 0
  for (x y) (u v) (result:+= (* x y))
  eval result
}

# define 2 vector
const v1 (Vector 1 2 3)
const v2 (Vector 2 4 6)
println "scalar product [1 2 3][2 4 6] = " (scalar-product v1 v2)