Description of gecon

gecon		Programmers Guide
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Category:mtl2lapack

Component type:function

Prototype

template <class LapackMatA, class Real> int gecon(char _norm, const LapackMatA& a, const Real& _anorm, Real& rcond) ;

Description

Estimate the reciprocal of the condition number of a general matrix A, with either the one-norm or the infinity-norm. GECON uses the LU factorization computed by GETRF. Currently MTL only handles column oriented matrices for this function.

norm (IN - char) Specifies whether to do one-norm or infinity norm. One of the following is required: '1' the 1-norm condition number 'I' the infinity-norm condition number
a (IN - matrix(M,N)) The coefficient matrix A.
anorm (IN - Real number) The one or infinity norm of matrix A, which is of the same numerical type as A.
rcond (OUT - Real number) The estimated reciprocal condition of matrix A.
info (OUT - int) 0 : function completed normally < 0 : The ith argument, where i = abs(return value) had an illegal value.

Definition

mtl2lapack.h

Preconditions

Complexity

Example

Notes

See also