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Man Pages
lis_array_qr(3f) Lis Library Functions lis_array_qr(3f)

lis_array_qr - calculate the eigenvalues with the QR algorithm

subroutine lis_array_cgs(LIS_INTEGER n, LIS_SCALAR a(), LIS_SCALAR q(), LIS_SCALAR r(), LIS_INTEGER qriter, LIS_SCALAR qrerr, LIS_INTEGER ierr);

Calculate the eigenvalues of matrix A with the QR algorithm.

n
The size of the matrices

a
The array that stores matrix A of size n * n

q
The work array Q of size n * n

r
The work array R of size n * n

a
The array that stores the block upper-triangular matrix with eigenvalues in the block diagonal elements after similarity transformation

qriter
The number of iterations of the QR algorithm

qrerr
The 2-norm of the first subdiagonal element A(2,1) after similarity transformation

lis(3)

http://www.ssisc.org/lis/

1 Nov 2014 Man Page

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