Thread: 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.

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

I should have 1 1,, 1
-1 1,, 1
1 1,, 1 thanks again.

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

I see thats right, I fliped it wrong, thanks for getting me back on track,