|void||zgscon (char *norm, SuperMatrix *L, SuperMatrix *U, double anorm, double *rcond, SuperLUStat_t *stat, int *info)|
-- SuperLU routine (version 3.0) -- Univ. of California Berkeley, Xerox Palo Alto Research Center, and Lawrence Berkeley National Lab. October 15, 2003
Modified from lapack routines ZGECON.
|void zgscon||(||char *||norm,|
ZGSCON estimates the reciprocal of the condition number of a general real matrix A, in either the 1-norm or the infinity-norm, using the LU factorization computed by ZGETRF. *
An estimate is obtained for norm(inv(A)), and the reciprocal of the condition number is computed as RCOND = 1 / ( norm(A) * norm(inv(A)) ).
See supermatrix.h for the definition of 'SuperMatrix' structure.
NORM (input) char* Specifies whether the 1-norm condition number or the infinity-norm condition number is required: = '1' or 'O': 1-norm; = 'I': Infinity-norm.
L (input) SuperMatrix* The factor L from the factorization Pr*A*Pc=L*U as computed by zgstrf(). Use compressed row subscripts storage for supernodes, i.e., L has types: Stype = SLU_SC, Dtype = SLU_Z, Mtype = SLU_TRLU.
U (input) SuperMatrix* The factor U from the factorization Pr*A*Pc=L*U as computed by zgstrf(). Use column-wise storage scheme, i.e., U has types: Stype = SLU_NC, Dtype = SLU_Z, Mtype = SLU_TRU.
ANORM (input) double If NORM = '1' or 'O', the 1-norm of the original matrix A. If NORM = 'I', the infinity-norm of the original matrix A.
RCOND (output) double* The reciprocal of the condition number of the matrix A, computed as RCOND = 1/(norm(A) * norm(inv(A))).
INFO (output) int* = 0: successful exit < 0: if INFO = -i, the i-th argument had an illegal value