Multiply a Column X61103
Write a function prod_col(i, m) that receives the index i of one column of a matrix of int’s m and returns the product of all the integers in that column. 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 columns, we are guaranteed that 0 ≤ i < n.
Observation
Observe that 0 ≤ i < n implies that the rows of m, if any, have that column and are hence nonempty, but nothing else.
Sample session
>>> prod_col(0, ((8, 0, 2, -1), (4, 3, 2, 1), (10, 11, -11, -10))) 320 >>> prod_col(0, ((8, 0, 2, -1), (4, 3, 2, 1), (10, 11, -11, -10))) + prod_col(2, ((8, 0, 2, -1), (4, 3, 2, 1), (10, 11, -11, -10))) 276 >>> prod_col(1, ((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