Is it possible to extract the diagonal elements of a matrix into a vector by using matrix multiplication only? If it is possible show how ;)
I'm curious how long it will take for you guys to answer this. Btw, no element by element multiplication is allowed.
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={MMULT(horizontal,MMULT(matrix,TRANSPOSE(horizontal))}
This results in a number. The question asks for a column vector with the diagonal elements in it. ;)
Look, I don't know how to do it in excel because I refuse to lower my standards to it, but in general
Ax = b
Take a 2-by-2 matrix A, where a_ij is the ith row and jth column element (i,j
[quote=maximumlikelihood]Look, I don't know how to do it in excel because I refuse to lower my standards to it, but in general
Ax = b
Take a 2-by-2 matrix A, where a_ij is the ith row and jth column element (i,j
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