# Daily Data Science Puzzle

## [Numpy * Operator] Element-wise Multiplication in Python

NumPy is a popular Python library for data science. Numpy focuses on array, vector, and matrix computations. If you work with data, you cannot avoid NumPy. So learn it now and learn it well. In this tutorial, you’ll learn how to calculate the Hadamard Product (= element-wise multiplication) of two 1D lists, 1D arrays, or …

## Exploring Shape, Reshape, and Average in Numpy

Daily Data Science Puzzle   What is the output of this puzzle? Numpy is a popular Python library for data science focusing on linear algebra. This advanced puzzle combines multiple language concepts and numpy features. The topic is a miniature stock analysis of the Apple stock. The puzzle creates a one-dimensional numpy array from raw …

## Python Numpy 101: How to Calculate the Row Variance of a Numpy 2D Array?

You can play with the following interactive Python code to calculate the variance of a 2D array (total, row, and column variance). Here’s another practical example: What is the output of this puzzle?*Advanced Level* (solution below) Numpy is a popular Python library for data science focusing on arrays, vectors, and matrices. This puzzle introduces a …

## How to Calculate Variance of Python NumPy Arrays?

Numpy is a popular Python library for data science focusing on arrays, vectors, and matrices. Did you already learn something new today? Let’s master the popular variance function in NumPy! Problem: How to calculate the variance of a NumPy array? Solution: To calculate the variance of a Python NumPy array x, use the function np.var(x). …