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| lis_array_qr(3) | Lis Library Functions | lis_array_qr(3) |
NAME
lis_array_qr - calculate the eigenvalues with the QR algorithmSYNOPSIS
#include "lis.h"LIS_INT lis_array_qr(LIS_INT n, LIS_SCALAR a[], LIS_SCALAR q[], LIS_SCALAR r[], LIS_INT *qriter, LIS_SCALAR *qrerr);
DESCRIPTION
Calculate the eigenvalues of matrix A with the QR algorithm.INPUT
- 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
OUTPUT
- 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
EXIT STATUS
The following exit values are returned:- 0
- The process is normally terminated
- unspecified
- An error occurred
SEE ALSO
lis(3)http://www.ssisc.org/lis/
| 1 Nov 2014 | Man Page |
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