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Least-squares solution

  1. Nov 16, 2008 #1
    I really need your help with this.
    Let A = (1 -2
    -1 2
    0 3
    2 5)
    and b = ( 3

    (a) Find a least-squares solution of Ax = b.
    (b) Find the orthogonal projection of b onto the column space of A.
    (c) Compute the least-squares error ( in the solution of part ( a )).
    Thank you!
  2. jcsd
  3. Nov 16, 2008 #2


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    Science Advisor

    What do you want? It is impossible to give hints if we don't know what you have done and where you are stuck. And we can only tell that by seeing what you have tried.
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