June 6th, 2013, 03:50 AM  #1 
Newbie Joined: Jun 2013 Posts: 2 Thanks: 0  Matrix  problem
Dear all, I have some problems with matrix calculations. I have equation X^T * X = A. Matrix X and A are symmetrical and they are 3 x 3. I know the matrix A. How to calculate matrix X from the equation X^T * X = A ??? Regards, Michal 
June 6th, 2013, 05:27 PM  #2 
Math Team Joined: Sep 2007 Posts: 2,409 Thanks: 6  Re: Matrix  problem
If X is symmetrical then X^T= X, so X^TX= X^2= A. Let Then So if A is given as, say, We must have , , , , , Six quadratic equations to solve for a, b, c, d, e, f. 
June 11th, 2013, 03:23 AM  #3 
Newbie Joined: Jun 2013 Posts: 2 Thanks: 0  Re: Matrix  problem
Thanks for your response. Yes, I will have 6 quadratic equations to solve for a, b, c, d, e, f. I started to solve it, but it's not easy to solve such quadratic equations.


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