If I had a set of matrices a,b, and c, and I knew a*b=c, how would I find matrix a?

assuming;

matrix a= a 3x4 matrix, values unknown

matrix b= a 4x1 matrix, values = M1 M2 M3 M4

matrix c= a 3x1 matrix, values = 0 0 0

Printable View

- February 1st 2011, 10:36 PMsheepersolving a matrix problem
If I had a set of matrices a,b, and c, and I knew a*b=c, how would I find matrix a?

assuming;

matrix a= a 3x4 matrix, values unknown

matrix b= a 4x1 matrix, values = M1 M2 M3 M4

matrix c= a 3x1 matrix, values = 0 0 0 - February 1st 2011, 11:11 PMProve It

. - February 2nd 2011, 03:26 AMAckbeet
Are you guaranteed that is invertible? In fact, given that you're generating a whole matrix out of one column vector, I can't help but wonder if you aren't guaranteed that it

**doesn't**have an inverse! Is there another way to do this, do you think, Prove It? - February 2nd 2011, 03:38 AMProve It
- February 2nd 2011, 03:45 AMAckbeet
With 3 equations and 12 unknowns, I don't think there's enough information to find a. You might be able to find a 9-parameter family of solutions. That's a lot of guessing!