Multiply a Row X35644

Statement

Write a function $prod\_row(i, m)$ that receives the index $i$ of one row of a matrix of int’s $m$ and returns the product of all the integers in that row. The matrix of int’s is represented as a tuple of rows, each row being, in turn, a tuple of int’s. If $m$ has $n$ rows, we are guaranteed that $0 \leq i < n$ .

Observation

Observe that $0 \leq i < n$ implies that the tuple $m$ is nonempty, but nothing else.

Sample session

>>> prod_row(1, ((8, 0, 2, -1), (4, 3, 2, 1), (10, 11, -11, -10)))
24
>>> prod_row(1, ((8, 0, 2, -1), (4, 3, 2, 1), (10, 11, -11, -10))) + prod_row(2, ((8, 0, 2, -1), (4, 3, 2, 1), (10, 11, -11, -10)))
12124
>>> prod_row(0, ((8, 0, 2, -1), (4, 3, 2, 1), (10, 11, -11, -10)))
0

Information

Author: José Luis Balcázar
Language: English
Official solutions: Python
User solutions: Python