FAQ: Linear Algebra with Python - Review

This community-built FAQ covers the “Review” exercise from the lesson “Linear Algebra with Python”.

Paths and Courses
This exercise can be found in the following Codecademy content:

Fundamental Math for Data Science

FAQs on the exercise Review

There are currently no frequently asked questions associated with this exercise – that’s where you come in! You can contribute to this section by offering your own questions, answers, or clarifications on this exercise. Ask or answer a question by clicking reply (reply) below.

If you’ve had an “aha” moment about the concepts, formatting, syntax, or anything else with this exercise, consider sharing those insights! Teaching others and answering their questions is one of the best ways to learn and stay sharp.

Join the Discussion. Help a fellow learner on their journey.

Ask or answer a question about this exercise by clicking reply (reply) below!
You can also find further discussion and get answers to your questions over in #get-help.

Agree with a comment or answer? Like (like) to up-vote the contribution!

Need broader help or resources? Head to #get-help and #community:tips-and-resources. If you are wanting feedback or inspiration for a project, check out #project.

Looking for motivation to keep learning? Join our wider discussions in #community

Learn more about how to use this guide.

Found a bug? Report it online, or post in #community:Codecademy-Bug-Reporting

Have a question about your account or billing? Reach out to our customer support team!

None of the above? Find out where to ask other questions here!

Rather confused about this one, this last question linear equation solution doesn’t appear to match with what is being asked?

""" Given this set of equations: 2a + 3d - 2c = 4 -c + 4b - a = 1 2d - 2c + 3a - b = 2 -2a + 3c - b = -2 """ #here's my corresponding matrix and vector A = np.array([[2,0,-2,3],[-1,4,-1,0],[3,-1,-2,2],[-2,1,3,0]]) b = np.array([4,1,2,-2]) #here's the solution: A = np.array([[2, -1, 3, -2],[0, 4, -1, -1],[-2, -1, -2, 3], [3, 0, 2, 0]]) b = np.array([4, 1, 2, -2])

In the solution the first vector in the matrix contains 4 elements [2, -1, 3, -2] but in the actual equation there’s only 3 elements? Am I missing something here, I tried to solve it like the last exercise.

Thanks

Hi! I faced the same issue and googled. I think the solution answer is wrong as it collates the x values from across all the equations into the same row. Had to find out but this link should help. Your answer is correct

1 Like