Lecture Notes on 14 Apr 2014

import random

# compute the scalar product of two vectors
def dot_product (a, b):
  sum = 0
  for i in range (len(a)):
    sum += a[i] * b[i]
  return sum

# sum the rows in a 2-D list
def sum_rows (a):
  for row in a:
    sum = 0
    for col in row:
      sum += col
    print (sum)

# add two compatible matrices
def matrix_add (a, b):
  c = []
  for i in range (len(a)):
    d = []
    for j in range (len(a[0])):
      d.append (a[i][j] + b[i][j])
    c.append (d)
 
  return c


def main():
  # create a 2-D list  (3 x 5) and fill with random numbers
  b = []
  for i in range (3):
    c = []
    for j in range (5):
      c.append (random.randint(1, 100))
    b.append (c)

  # find the range in that 2-D list
  max_num = b[0][0]
  min_num = b[0][0]
  for row in b:
    for col in row:
      if (col > max_num):
        max_num = col
      if (col < min_num):
        min_num = col
  extent = max_num - min_num


main()