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<meta content="text/html;charset=UTF-8" http-equiv="Content-Type">
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<title>SuperLU: SRC/sgscon.c File Reference</title>
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Main Page
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Data Structures
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Files
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SRC/sgscon.c File ReferenceEstimates 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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 1.5.5
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