Matrix Multiplication - [Python 3.5]

matrix_multiplication.py

"""Multiply two matrices using helper functions; outputs resulting matrix."""


def get_row(matrix, row):
    return matrix[row]


def get_column(matrix, column_number):
    column = []

    for i in range(len(matrix)):
        column.append(matrix[i][column_number])

    return column


def dot_product(vector_one, vector_two):
    total = 0

    if len(vector_one) != len(vector_two):
        return total

    for i in range(len(vector_one)):
        product = vector_one[i] * vector_two[i]
        total += product

    return total


def matrix_multiplication(matrix_one, matrix_two):
    m_rows = len(matrix_one)
    p_columns = len(matrix_two[0])

    result = []

    for i in range(m_rows):

        row_result = []

        for j in range(p_columns):
            row = get_row(matrix_one, i)
            column = get_column(matrix_two, j)
            product = dot_product(row, column)

            row_result.append(product)

        result.append(row_result)

    return result