##### hecon

###### Prototype

There is one prototype of `hecon` available, please see below.

    hecon( const MatrixA& a, const VectorIPIV& ipiv, const Scalar >,
            Scalar > );

###### Description

`hecon` (short for $FRIENDLY_NAME) provides a C++ interface to LAPACK routines SSYCON, DSYCON, CHECON, and ZHECON. `hecon` estimates the reciprocal of the condition number of a complex Hermitian matrix A using the factorization A = UD*U*H or A = LD*L*H computed by ZHETRF.

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

The selection of the LAPACK routine is done during compile-time, and is determined by the type of values contained in type `MatrixA`. The type of values is obtained through the `value_type` meta-function `typename value_type<MatrixA>::type`. The dispatching table below illustrates to which specific routine the code path will be generated.

Table 1.251. Dispatching of hecon

Value type of MatrixA | LAPACK routine
--- | ---
`float` | SSYCON
`double` | DSYCON
`complex<float>` | CHECON
`complex<double>` | ZHECON

###### Definition

Defined in header `boost/numeric/bindings/lapack/computational/hecon.hpp`.

###### Parameters or Requirements on Types

Parameters

MatrixA

  The definition of term 1

MatrixB

  The definition of term 2

MatrixC

  The definition of term 3.

  Definitions may contain paragraphs.

###### Complexity

###### Example

    #include <boost/numeric/bindings/lapack/computational/hecon.hpp>
    using namespace boost::numeric::bindings;

    lapack::hecon( x, y, z );

this will output

    [5] 0 1 2 3 4 5

###### Notes

###### See Also

- Originating Fortran source files ssycon.f, dsycon.f, checon.f, and zhecon.f at Netlib.