A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • 5 years ago

Is there a way for me to access only certain elements in a 2D array, for example the vertical elements only or the first elements in a set of ordered pairs, in Python?

  • This Question is Closed
  1. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    2D arrays? you mean lists of lists, or python's array module, or do you mean numpy's arrays?

  2. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    lists of lists: A = [[1,0,0], [0,1,0], [0,0,1]] if you only want to get out the 'columns' then you can transpose it using list comprehensions.

  3. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    or you can simply loop: col2 = [] for row in A: col2.append(row[1]) # gets out the elements in the 2nd "column"

  4. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    list comprehensions: col2 = [row[1] for row in A]

  5. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    sets of ordered pairs? you mean Python's native set() ?

  6. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.