fossilesque@lemmy.dbzer0.comM to Science Memes@mander.xyzEnglish · 2 days agoidentity theftlemmy.dbzer0.comimagemessage-square15fedilinkarrow-up194arrow-down13
arrow-up191arrow-down1imageidentity theftlemmy.dbzer0.comfossilesque@lemmy.dbzer0.comM to Science Memes@mander.xyzEnglish · 2 days agomessage-square15fedilink
minus-squarepseudo@jlai.lulinkfedilinkEnglisharrow-up9·edit-220 hours agoThat matrix of zeros with one in diagonal is called the matrix of identity. It is famous because when doing multiplication on matrix or vector, it acts likes 1 on “normal” number: x times 1 is x anyMatrix times Identity is anyMatrix.
minus-squarefallingcats@discuss.tchncs.delinkfedilinkEnglisharrow-up4·20 hours agoWouldn’t you need to put anyMatrix first, since matrix multiplication isn’t commutative?
minus-squarefallingcats@discuss.tchncs.delinkfedilinkEnglisharrow-up1·20 hours agoNo I just tried it and I was wrong, it seems like it doesn’t matter for the I’d matrix specifically
minus-squareMBM@lemmings.worldlinkfedilinkEnglisharrow-up1·20 hours agoHuh? Identity times anyMatrix is also anyMatrix. The matrix just has to have the right dimensions
That matrix of zeros with one in diagonal is called the matrix of identity.
It is famous because when doing multiplication on matrix or vector, it acts likes 1 on “normal” number:
x times 1 is x anyMatrix times Identity is anyMatrix.
Wouldn’t you need to put
anyMatrixfirst, since matrix multiplication isn’t commutative?You are right. I will correct it.
No I just tried it and I was wrong, it seems like it doesn’t matter for the I’d matrix specifically
Huh? Identity times anyMatrix is also anyMatrix. The matrix just has to have the right dimensions