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<meta content="text/html;charset=UTF-8" http-equiv="Content-Type">
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<title>SuperLU: SRC/slacon.c File Reference</title>
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<link href="doxygen.css" rel="stylesheet" type="text/css">
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Main Page
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Data Structures
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Files
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SRC/slacon.c File ReferenceEstimates the 1-norm. More...
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#include <math.h>
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#include "slu_Cnames.h"
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Defines
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#define d_sign(a, b) (b >= 0 ? fabs(a) : -fabs(a))
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#define i_dnnt(a) ( a>=0 ? floor(a+.5) : -floor(.5-a) )
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Functions
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int slacon_ (int *n, float *v, float *x, int *isgn, float *est, int *kase)
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Detailed Description
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-- SuperLU routine (version 2.0) --
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Univ. of California Berkeley, Xerox Palo Alto Research Center,
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and Lawrence Berkeley National Lab.
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November 15, 1997
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Define Documentation
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#define d_sign
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(
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a,
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b
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)
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(b >= 0 ? fabs(a) : -fabs(a))
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#define i_dnnt
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(
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a
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)
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( a>=0 ? floor(a+.5) : -floor(.5-a) )
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Function Documentation
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int slacon_
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(
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int *
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n,
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float *
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v,
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float *
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x,
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int *
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isgn,
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float *
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est,
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int *
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kase
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)
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Purpose
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=======
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SLACON estimates the 1-norm of a square matrix A.
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Reverse communication is used for evaluating matrix-vector products.
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Arguments
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=========
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N (input) INT
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The order of the matrix. N >= 1.
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V (workspace) FLOAT PRECISION array, dimension (N)
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On the final return, V = A*W, where EST = norm(V)/norm(W)
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(W is not returned).
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X (input/output) FLOAT PRECISION array, dimension (N)
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On an intermediate return, X should be overwritten by
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A * X, if KASE=1,
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A' * X, if KASE=2,
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and SLACON must be re-called with all the other parameters
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unchanged.
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ISGN (workspace) INT array, dimension (N)
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EST (output) FLOAT PRECISION
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An estimate (a lower bound) for norm(A).
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KASE (input/output) INT
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On the initial call to SLACON, KASE should be 0.
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On an intermediate return, KASE will be 1 or 2, indicating
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whether X should be overwritten by A * X or A' * X.
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On the final return from SLACON, KASE will again be 0.
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Further Details
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======= =======
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Contributed by Nick Higham, University of Manchester.
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Originally named CONEST, dated March 16, 1988.
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Reference: N.J. Higham, "FORTRAN codes for estimating the one-norm of
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a real or complex matrix, with applications to condition estimation",
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ACM Trans. Math. Soft., vol. 14, no. 4, pp. 381-396, December 1988.
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=====================================================================
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<address style="text-align: right;"><small>Generated on Mon Nov 22 10:23:48 2010 for SuperLU by </small></address>
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 1.5.5
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