Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing
frx
Group Title
The vectors (1,2,3,4),(0,1,2,3),(0,0,1,2),(0,0,0,1) creates a basis in R^4. Decide the coordinates for the vector (1,1,1,1) in the given basis.
 one year ago
 one year ago
frx Group Title
The vectors (1,2,3,4),(0,1,2,3),(0,0,1,2),(0,0,0,1) creates a basis in R^4. Decide the coordinates for the vector (1,1,1,1) in the given basis.
 one year ago
 one year ago

This Question is Closed

frx Group TitleBest ResponseYou've already chosen the best response.0
The answer is (1,1,0,0) however I don't know how to get there.
 one year ago

Tushara Group TitleBest ResponseYou've already chosen the best response.2
i hope that helps, all u need is a vectors that u can multiply the basis with to get [1 1 1 1]
 one year ago

frx Group TitleBest ResponseYou've already chosen the best response.0
Ohh I see, thank you very very much! :)
 one year ago

RolyPoly Group TitleBest ResponseYou've already chosen the best response.0
Excuse me, why do we use row vectors instead of column vectors in this case? Are the two the same?
 one year ago

Tushara Group TitleBest ResponseYou've already chosen the best response.2
actually, the basis is given to us, so we dont need to find it, but if we were to find it then we have to put the vectors in columns.... frx gave the basis as row vectors, the question was not in proper notation
 one year ago

RolyPoly Group TitleBest ResponseYou've already chosen the best response.0
Does that mean when we do this question, we put the vectors in rows, since the given vectors are row vectors. When the given vectors are column vectors, when we need to put it in columns? I'm sorry, I'm quite confused.
 one year ago

RolyPoly Group TitleBest ResponseYou've already chosen the best response.0
Also, how do you find the B for \(B \cdot A\)? And.... Why is the multiplication correct? I mean B is a 1x4 matrix and A is a 3x4 matrix. How can we find the matrix product \(B \cdot A\)?
 one year ago

Tushara Group TitleBest ResponseYou've already chosen the best response.2
matrix multiplication works like that.... matrices dont need to be the same size to multiply dem
 one year ago

Tushara Group TitleBest ResponseYou've already chosen the best response.2
check out example 1 here: http://www.mathwarehouse.com/algebra/matrix/multiplymatrix.php
 one year ago

RolyPoly Group TitleBest ResponseYou've already chosen the best response.0
The problem is that for matrix multiplication, we need the number of columns of the first matrix equal to the number of rows of the second matrix. But in your working, B is a 1x4 matrix, while A is a 3x4 matrix. The number of columns of B is not equal to the number of rows of A, so, I think the matrix multiplication is undefined.
 one year ago

Tushara Group TitleBest ResponseYou've already chosen the best response.2
A is a 4x4 matrix... take a look at it again, u didnt see it right
 one year ago

RolyPoly Group TitleBest ResponseYou've already chosen the best response.0
I see the problem now... The first matrix A is a 4x4 matrix. But when you write BA, the matrix A there is of the size 3x4. You missed the third row there. I was looking at that BA, and didn't realise that you missed a row there. Sorry!!!
 one year ago

Tushara Group TitleBest ResponseYou've already chosen the best response.2
ohhh yes, i did miss a row, sorry
 one year ago

RolyPoly Group TitleBest ResponseYou've already chosen the best response.0
Thanks a lot though! I understand how to do this question now :)
 one year ago
See more questions >>>
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
 Engagement 19 Mad Hatter
 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.