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8. LU decomposition using Gauss Elimination method of matrix example ( Enter your problem )
  1. Example `[[8,-6,2],[-6,7,-4],[2,-4,3]]`
  2. Example `[[3,2,4],[2,0,2],[4,2,3]]`
  3. Example `[[1,1,1],[-1,-3,-3],[2,4,4]]`
  4. Example `[[2,3],[4,10]]`

2. Example `[[3,2,4],[2,0,2],[4,2,3]]`





Find LU Decomposition using Gauss Elimination method of Matrix ...
`[[3,2,4],[2,0,2],[4,2,3]]`


Solution:
`LU` decomposition : If we have a square matrix A, then an upper triangular matrix U can be obtained without pivoting under Gaussian Elimination method, and there exists lower triangular matrix L such that A=LU.


Here `A` = 
`3``2``4`
`2``0``2`
`4``2``3`


Using Gaussian Elimination method
`R_2 larr R_2-``(0.6666666667)``xx R_1` `[:.L_(2,1)=color{blue}{0.6666666667}]`

 = 
`3``2``4`
`0``-1.3333333333``-0.6666666667`
`4``2``3`


`R_3 larr R_3-``(1.3333333333)``xx R_1` `[:.L_(3,1)=color{blue}{1.3333333333}]`

 = 
`3``2``4`
`0``-1.3333333333``-0.6666666667`
`0``-0.6666666667``-2.3333333333`


`R_3 larr R_3-``(0.5)``xx R_2` `[:.L_(3,2)=color{blue}{0.5}]`

 = 
`3``2``4`
`0``-1.3333333333``-0.6666666667`
`0``0``-2`


`:.U` = 
`3``2``4`
`0``-1.3333333333``-0.6666666667`
`0``0``-2`


`L` is just made up of the multipliers we used in Gaussian elimination with 1s on the diagonal.

`:.L` = 
`1``0``0`
`color{blue}{0.6666666667}``1``0`
`color{blue}{1.3333333333}``color{blue}{0.5}``1`


Now checking `A=LU` ?

`LU` = 
`1``0``0`
`0.6666666667``1``0`
`1.3333333333``0.5``1`
 `xx` 
`3``2``4`
`0``-1.3333333333``-0.6666666667`
`0``0``-2`
 = 
`3``2``4`
`2``0``2`
`4``2``3`


And `A` = 
`3``2``4`
`2``0``2`
`4``2``3`


Solution is possible.




This material is intended as a summary. Use your textbook for detail explanation.
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