Tuesday, 13 February 2018

matrices - Finding the values of a vector if the vector.matrix product and the value of the matrix is known (only using left multiplication operations)

Given an unknown input vector V=(v1,v2,v3,v4), a known 4×4 matrix A and a known vector-matrix product M=[m1,...,m4]. Can you discover V?




Normally you would just take the inverse of A, and right multiply it with M to get V. However, here's the trick - in this environment, you are not allowed to right multiply, only left multiply with 4×4 matrices.



Is there a sequence of left multiplication operations that will produce the original vector? (I don't think so, but I had to ask)



(Note - no transpose operations are permitted: only 4×4 multiplication)

No comments:

Post a Comment

real analysis - How to find limhrightarrow0fracsin(ha)h

How to find limh0sin(ha)h without lhopital rule? I know when I use lhopital I easy get $$ \lim_{h\rightarrow 0}...