##### ppcon

###### Prototype

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

    ppcon( const MatrixAP& ap, const Scalar >, Scalar > );

###### Description

`ppcon` (short for $FRIENDLY_NAME) provides a C++ interface to LAPACK routines SPPCON, DPPCON, CPPCON, and ZPPCON. `ppcon` estimates the reciprocal of the condition number (in the 1-norm) of a complex Hermitian positive definite packed matrix using the Cholesky factorization A = U**H*U or A = LL*H computed by ZPPTRF.

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 `MatrixAP`. The type of values is obtained through the `value_type` meta-function `typename value_type<MatrixAP>::type`. The dispatching table below illustrates to which specific routine the code path will be generated.

Table 1.275. Dispatching of ppcon

Value type of MatrixAP | LAPACK routine
--- | ---
`float` | SPPCON
`double` | DPPCON
`complex<float>` | CPPCON
`complex<double>` | ZPPCON

###### Definition

Defined in header `boost/numeric/bindings/lapack/computational/ppcon.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/ppcon.hpp>
    using namespace boost::numeric::bindings;

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

this will output

    [5] 0 1 2 3 4 5

###### Notes

###### See Also

- Originating Fortran source files sppcon.f, dppcon.f, cppcon.f, and zppcon.f at Netlib.