Python Data Science Essentials - Second Edition

Creating NumPy arrays

There is more than one way to create NumPy arrays. The following are some of the ways:

• Transforming an existing data structure into an array
• Creating an array from scratch and populating it with default or calculated values
• Uploading some data from a disk into an array

If you are going to transform an existing data structure, the odds are in favor of you working with a structured list or a pandas DataFrame.

From lists to unidimensional arrays

One of the most common situations you will encounter when working with data is the transforming of a list into an array.

When operating such a transformation, it is important to consider the objects the lists contain because this will determine the dimensionality and the dtype of the resulting ...