Saving and loading data (scipy.io) - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the main purpose of the scipy.io module?

The scipy.io module helps save and load data files in different formats, making it easy to share and reuse data in Python programs.

beginner

Which function in scipy.io is used to save data in MATLAB .mat file format?

The function scipy.io.savemat() saves Python data structures like dictionaries into MATLAB .mat files.

beginner

How do you load data from a MATLAB .mat file using scipy.io?

Use scipy.io.loadmat() to read data from a .mat file. It returns a dictionary with variable names as keys and data as values.

intermediate

What data types can scipy.io.savemat() handle when saving to a .mat file?

It can save dictionaries containing arrays, lists, numbers, and strings. The keys become variable names in the MATLAB file.

intermediate

Why might you want to use scipy.io to save and load data instead of plain text files?

Because scipy.io supports complex data formats like MATLAB files, it preserves data types and structure better than plain text, making data exchange easier and more reliable.

Which function saves data to a MATLAB .mat file?

A save()

B loadmat()

C savemat()

D load()

savemat() saves data to .mat files, while loadmat() loads data from them.

What does loadmat() return when loading a .mat file?

A A dictionary with variable names as keys

B A list of arrays

C A single array

D A string with file content

loadmat() returns a dictionary where keys are variable names and values are the data.

Which data structure is commonly used with savemat() to organize data?

A List

B Tuple

C Set

D Dictionary

savemat() expects a dictionary where keys become variable names in the saved file.

If you want to save a NumPy array to a .mat file, what should you do?

A Put the array inside a dictionary and pass it to <code>savemat()</code>

B Pass the array directly to <code>savemat()</code>

C Convert the array to a list first

D Use <code>loadmat()</code>

You should put the array inside a dictionary with a variable name as key before passing to savemat().

Which of these is NOT a benefit of using scipy.io for saving/loading data?

A Preserves data types and structure

B Automatically visualizes data

C Eases data exchange between Python and MATLAB

D Supports MATLAB file format

scipy.io does not visualize data; it only saves and loads data files.

Explain how to save a NumPy array to a MATLAB .mat file using scipy.io. Include the key steps and functions.

Think about how MATLAB variables are represented and how Python dictionaries map to them.

Describe how loadmat() helps when working with MATLAB data files in Python.

Consider how you access MATLAB variables after loading.