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<title>SuperLU: SRC/sgscon.c File Reference</title>
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    SRC/sgscon.c File Reference

    Estimates reciprocal of the condition number of a general matrix. More...
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    #include <math.h>
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    #include "slu_sdefs.h"
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    Functions

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    void sgscon (char *norm, SuperMatrix *L, SuperMatrix *U, float anorm, float *rcond, SuperLUStat_t *stat, int *info)
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    Detailed Description

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     -- SuperLU routine (version 3.0) --
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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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     October 15, 2003

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     Modified from lapack routines SGECON.
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    Function Documentation

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              void sgscon           
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              (
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              char * 
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               norm, 
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              SuperMatrix
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               L, 
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              SuperMatrix
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               U, 
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              float 
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               anorm, 
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              float * 
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               rcond, 
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              SuperLUStat_t
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               stat, 
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              int * 
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               info 
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              )
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       Purpose   
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       =======

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       SGSCON estimates the reciprocal of the condition number of a general 
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       real matrix A, in either the 1-norm or the infinity-norm, using   
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       the LU factorization computed by SGETRF.   *

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       An estimate is obtained for norm(inv(A)), and the reciprocal of the   
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       condition number is computed as   
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          RCOND = 1 / ( norm(A) * norm(inv(A)) ).

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       See supermatrix.h for the definition of 'SuperMatrix' structure.

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       Arguments   
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       =========

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        NORM    (input) char*
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                Specifies whether the 1-norm condition number or the   
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                infinity-norm condition number is required:   
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                = '1' or 'O':  1-norm;   
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                = 'I':         Infinity-norm.

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        L       (input) SuperMatrix*
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                The factor L from the factorization Pr*A*Pc=L*U as computed by
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                sgstrf(). Use compressed row subscripts storage for supernodes,
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                i.e., L has types: Stype = SLU_SC, Dtype = SLU_S, Mtype = SLU_TRLU.

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        U       (input) SuperMatrix*
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                The factor U from the factorization Pr*A*Pc=L*U as computed by
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                sgstrf(). Use column-wise storage scheme, i.e., U has types:
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                Stype = SLU_NC, Dtype = SLU_S, Mtype = SLU_TRU.

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        ANORM   (input) float
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                If NORM = '1' or 'O', the 1-norm of the original matrix A.   
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                If NORM = 'I', the infinity-norm of the original matrix A.

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        RCOND   (output) float*
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               The reciprocal of the condition number of the matrix A,   
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               computed as RCOND = 1/(norm(A) * norm(inv(A))).

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        INFO    (output) int*
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               = 0:  successful exit   
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               < 0:  if INFO = -i, the i-th argument had an illegal value

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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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