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January 31st, 2012, 05:39 PM   #1
Joined: Jan 2012

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QR factorization- Eigen values

QR factorization- Eigen values


I'm attempting to write a code for computing the Eigen values of a real symmetric matrix and I'm using the QR algorithm.I'm referring wiki,Numerical Recipees book and other web serach articles.

This is a part of the self-study course I'm doing in Linear Algebra to upgrde my skills.

My aim is not only getting the algorithm but also understanding Linear algebra and this site is a great help.

As I conclude, following algorithm is being planned by me for implemantation:

1. First and foremost carry out Householder transformation to obtain a tridiagonal matrix from (n-2) householder iterations where n is the size of the square symmetric matrix.

2. During each of the above n-2 iterations, we have Q1,Q2,Q3..Q(n-2) Householdr matrices

3. We can now obtain Q and R (of QR factorization) where Q is an orthogonal matrix and R is an upper triangular matrix

4. R = Qn-2* Qn-1*.*Q2*Q1

5. Q = Q1*Q2**Qn-2

6. Thus we decompose the original matrix A into A = QR

Am I right above?

I'm not very clear how to get Eigen values following this.Can anyone site a good refernce?

atee is offline  
February 11th, 2012, 03:01 PM   #2
Joined: Jan 2008

Posts: 22
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Re: QR factorization- Eigen values

"atee", did you ever solve your problem/complete your assignment?
TomF is offline  

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