Could one of you scholars please explain the joke for us smoothbrains who don't get it? All I see is a boolean matrix, and I'm not even sure that is correct.
this post was submitted on 15 Mar 2025
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A square matrix with the ones in the diagonal is called the identity matrix
It's an identity matrix. You multiple a vector with it and the result is still the same (identical) vector
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 anyMatrix first, 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 ID matrix specifically