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.
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.
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.
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
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