GSP
Quick Navigator

Search Site

Unix VPS
A - Starter
B - Basic
C - Preferred
D - Commercial
MPS - Dedicated
Previous VPSs
* Sign Up! *

Support
Contact Us
Online Help
Handbooks
Domain Status
Man Pages

FAQ
Virtual Servers
Pricing
Billing
Technical

Network
Facilities
Connectivity
Topology Map

Miscellaneous
Server Agreement
Year 2038
Credits
 

USA Flag

 

 

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

lis_array_qr - calculate the eigenvalues with the QR algorithm

#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);

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

The following exit values are returned:
0
The process is normally terminated
unspecified
An error occurred

lis(3)

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

1 Nov 2014 Man Page

Search for    or go to Top of page |  Section 3 |  Main Index

Powered by GSP Visit the GSP FreeBSD Man Page Interface.
Output converted with ManDoc.