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# Can you multiply the middle line of the 3x3 identity matrix to make an elementary mat watch

1. So that it looks like this?

2. (Original post by will'o'wisp2)
So that it looks like this?

If you're looking for a matrix to multiple by the id. matrix to get THAT one in your OP, then well, it's the identity matrix! The matrix you're looking for is in your own post.
3. (Original post by RDKGames)

If you're looking for a matrix to multiple by the id. matrix to get THAT one in your OP, then well, it's the identity matrix! The matrix you're looking for is in your own post.
The question is, is

and elementary matrix?
4. (Original post by will'o'wisp2)
The question is, is

and elementary matrix?
Then no. Do you see why?
5. (Original post by RDKGames)
Then no. Do you see why?
No because i thought you could multiply the middle row by 0 apparently not....

Edit: oh so the rule is multiply a row by a non zero constant, ye i got it now thanks a bunch
6. (Original post by will'o'wisp2)
No because i thought you could multiply the middle row by 0 apparently not....
Row multiplication is permitted for any nonzero constant.
7. (Original post by RDKGames)
Row multiplication is permitted for any nonzero constant.
Thank you

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