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Linear Algebra - Hooke's Law Problem

  1. Mar 3, 2016 #1
    1. The problem statement, all variables and given/known data

    For the system of springs
    Capture.PNG
    a) Assemble the stiffness matrix K and the force-displacement relations, K*u = f
    b) Find the L*D*L^T factorization of K. Use Matlab to solve
    c) Use the boundary conditions and applied forces to find the displacements
    2. Relevant equations


    3. The attempt at a solution
    I'm getting stuck on part c
    Capture.PNG
    Capture.PNG
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    My confusion lies in why is F = <10 10 10>^T? I don't see were these 10 values came from.

    Thanks for any help!
     
  2. jcsd
  3. Mar 3, 2016 #2

    vela

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    Looks like a mistake since gravity isn't involved in this problem.
     
  4. Mar 3, 2016 #3
    I think you might be right. I don't see how gravity is involved either.
     
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