CLACON man page on Oracle

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[printable version]

```clacon.f(3)			    LAPACK			   clacon.f(3)

NAME
clacon.f -

SYNOPSIS
Functions/Subroutines
subroutine clacon (N, V, X, EST, KASE)
CLACON estimates the 1-norm of a square matrix, using reverse
communication for evaluating matrix-vector products.

Function/Subroutine Documentation
subroutine clacon (integerN, complex, dimension( n )V, complex, dimension(
n )X, realEST, integerKASE)
CLACON estimates the 1-norm of a square matrix, using reverse
communication for evaluating matrix-vector products.

Purpose:

CLACON estimates the 1-norm of a square, complex matrix A.
Reverse communication is used for evaluating matrix-vector products.

Parameters:
N

N is INTEGER
The order of the matrix.  N >= 1.

V

V is COMPLEX array, dimension (N)
On the final return, V = A*W,  where  EST = norm(V)/norm(W)
(W is not returned).

X

X is COMPLEX array, dimension (N)
On an intermediate return, X should be overwritten by
A * X,   if KASE=1,
A**H * X,  if KASE=2,
where A**H is the conjugate transpose of A, and CLACON must be
re-called with all the other parameters unchanged.

EST

EST is REAL
On entry with KASE = 1 or 2 and JUMP = 3, EST should be
unchanged from the previous call to CLACON.
On exit, EST is an estimate (a lower bound) for norm(A).

KASE

KASE is INTEGER
On the initial call to CLACON, KASE should be 0.
On an intermediate return, KASE will be 1 or 2, indicating
whether X should be overwritten by A * X  or A**H * X.
On the final return from CLACON, KASE will again be 0.

Author:
Univ. of Tennessee

Univ. of California Berkeley

NAG Ltd.

Date:
September 2012

Further Details:
Originally named CONEST, dated March 16, 1988.

Contributors:
Nick Higham, University of Manchester

References:
N.J. Higham, 'FORTRAN codes for estimating the one-norm of
a real or complex matrix, with applications to condition
estimation', ACM Trans. Math. Soft., vol. 14, no. 4, pp. 381-396,
December 1988.

Definition at line 115 of file clacon.f.

Author
Generated automatically by Doxygen for LAPACK from the source code.

Version 3.4.2			Tue Sep 25 2012			   clacon.f(3)
```
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