#0099

Scale Rows With Multipliers

MediumNumPy25 min20 XP

Problem

Given matrix shape (rows, cols) and multipliers shape (rows,), return a matrix where each row is multiplied by its corresponding multiplier.

Why This Matters

Row-wise broadcasting is a common source of shape confusion. This problem makes the required reshape explicit.

Function Signature

def scale_rows(matrix, multipliers):

Examples

Example 1

Input[[1,2],[3,4]], [10,100]

Output[[10,20],[300,400]]

The first row is multiplied by 10 and second row by 100.

Constraints

Return the exact structure requested.
Handle the edge cases mentioned in the prompt.
Prefer clear logic over clever one-liners.

CodePython

import numpy as np

def scale_rows(matrix, multipliers):
    """
    Input example: [[1,2],[3,4]], [10,100]
    Return: [[10,20],[300,400]]
    Return the value from the function so the tests can compare it. Do not print unless the prompt asks.
    """
    # write your code here
    return matrix

import numpy as np

def scale_rows(matrix, multipliers):
    """
    Input example: [[1,2],[3,4]], [10,100]
    Return: [[10,20],[300,400]]
    Return the value from the function so the tests can compare it. Do not print unless the prompt asks.
    """
    # write your code here
    return matrix

Visible browser tests run here when available.

Testcases1 visible / 3 hidden categories

Core example

Input[[1,2],[3,4]], [10,100]

Expected[[10,20],[300,400]]

The first row is multiplied by 10 and second row by 100.

Hidden Test Categories

one rownegative multiplierfloat matrix