Results 1 to 5 of 5

Math Help - Inverse matrix

  1. #1
    Member
    Joined
    Jun 2006
    Posts
    165

    Question Inverse matrix

    Code:
    The inverse of   
                          1  -1   0
                          0   1   1
                          1   0  -1
    
      is.  My answer is
    
                          .5  .5  .5
                          .5  .5  .5
                          .5  .5  .5
    
      thanks for checking my answer.
    Last edited by CaptainBlack; July 20th 2006 at 09:17 AM.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Grand Panjandrum
    Joined
    Nov 2005
    From
    someplace
    Posts
    14,972
    Thanks
    4
    Quote Originally Posted by kwtolley
    Code:
    The inverse of   
                          1  -1   0
                          0   1   1
                          1   0  -1
    
      is.  My answer is
    
                          .5  .5  .5
                          .5  .5  .5
                          .5  .5  .5
    
      thanks for checking my answer.


    It can't be, just construct any row of the product of these two matrices.
    You will find all the elements in that row equal (either 1s or 0s depending
    on which row you consider, rather than two 0s and one 1.

    RonL
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Member
    Joined
    Jun 2006
    Posts
    165

    ok I see

    I should have 1 1,, 1
    -1 1,, 1
    1 1,, 1 thanks again.
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Grand Panjandrum
    Joined
    Nov 2005
    From
    someplace
    Posts
    14,972
    Thanks
    4
    Quote Originally Posted by kwtolley
    I should have 1 1,, 1
    -1 1,, 1
    1 1,, 1 thanks again.
    No,

    Code:
    >A=[1,-1,0;0,1,1;1,0,-1]
                1            -1             0 
                0             1             1 
                1             0            -1 
    >inv(A)
              0.5           0.5           0.5 
             -0.5           0.5           0.5 
              0.5           0.5          -0.5 
    >
    RonL
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Member
    Joined
    Jun 2006
    Posts
    165

    Talking yes thats right

    I see thats right, I fliped it wrong, thanks for getting me back on track,
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. [SOLVED] Finding the inverse of a matrix using it's elementary matrix?
    Posted in the Advanced Algebra Forum
    Replies: 3
    Last Post: March 7th 2011, 06:08 PM
  2. [SOLVED] Derivative of a matrix inverse and matrix determinant
    Posted in the Advanced Algebra Forum
    Replies: 1
    Last Post: February 24th 2011, 08:18 AM
  3. inverse matrix
    Posted in the Algebra Forum
    Replies: 1
    Last Post: December 2nd 2010, 08:13 PM
  4. Replies: 3
    Last Post: March 1st 2010, 06:22 AM
  5. matrix inverse
    Posted in the Advanced Algebra Forum
    Replies: 5
    Last Post: May 21st 2008, 11:27 AM

Search Tags


/mathhelpforum @mathhelpforum