##### trcon

###### Prototype

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

    trcon( const char norm, const MatrixA& a, Scalar > );

###### Description

`trcon` (short for $FRIENDLY_NAME) provides a C++ interface to LAPACK routines STRCON, DTRCON, CTRCON, and ZTRCON. `trcon` estimates the reciprocal of the condition number of a triangular matrix A, in either the 1-norm or the infinity-norm.

The norm of A is computed and an estimate is obtained for norm(inv(A)), then the reciprocal of the condition number is computed as RCOND = 1 / ( norm(A) * 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 1.304. Dispatching of trcon

Value type of MatrixA | LAPACK routine
--- | ---
`float` | STRCON
`double` | DTRCON
`complex<float>` | CTRCON
`complex<double>` | ZTRCON

###### Definition

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

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

this will output

    [5] 0 1 2 3 4 5

###### Notes

###### See Also

- Originating Fortran source files strcon.f, dtrcon.f, ctrcon.f, and ztrcon.f at Netlib.