1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Numerical linear Albebra

  1. Feb 4, 2007 #1
    1. The problem statement, all variables and given/known data

    In Matlab,

    Find the scalar (lamda) for which x+(lamda)v equals the solution obtained with the backslash operator \. Hence, x=B\b in matlab

    (This is another way of finding the inverse inv(B)... we could also use x=B\b)

    2. Relevant equations

    We have Bx = b

    B =
    [-1 2 -3
    0 4 1
    3 -6 9]

    b = [-12 -1 36]

    Null space v=[-14 -1 4]

    x = [-12.0000, -0.2143, -0.1429] <--- from B\b in matlab

    3. The attempt at a solution

    B*(x + (lamda)v) = b
    Bx + (lamda)Bv = b

    since v is the null space (lamda)Bv=0

    therefore, (lamda) could be anything?

    Is that correct?
  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted