I didn't know who else to ask so I'm hoping someone can give me some guidance here.
I have a test on Thursday and I'm doing practice papers, how do I do this question? I'm used to doing Gauss Jordan elimination WITH pivoting but not without.
The way I do it is usually row 1 - row 2, is it possible to just straight up take an element and subtract a value in general or does it always have to be row - row?
This is the question if anyone is willing to tell me how retarded I am
>>8592808
>is it possible to just straight up take an element and subtract a value
I don't know. Try to prove that "substracting a value" preserves the row space of a matrix and then call me when you find that it is contradictory or you found a dead end.
>>8592822
what? I mean as in can I take the first element of row 2 and subtract 0.00038 from it to give me 0 or is that not how it works?
BRAINLETS GET OFF MY BOARD
FUCKING BRAINLETS REEEEEEEEEEEEEEEE
>>8592895
>I mean as in can I take the first element of row 2 and subtract 0.00038 from it to give me 0 or is that not how it works?
I can tell you that that is definitely not how it works. That would change the row space.
>>8592916
So in this example how exactly am I supposed to get the matrix to having values that are 0 outside of the diagonal?
I know about having
1 0 0 0
0 1 0 0
0 0 1 0
0 0 0 1
But when it comes to decimals like these it's not that easy because they're so minor? Is there something I'm doing wrong?
>>8592965
if you wanna subtract, you have to subtract a whole row from a whole separate row, each entry individually. This is very basic matrix rules.
>>8592808
MINOR
COFACTOR
TRANSPOSE
BRAINLET