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| VectorNormSqFunctor Class Template Reference |
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A functor for computing the squared vector norm. More...

`#include "vigra/transformimage.hxx"`

## Public Types
typedef ValueType | argument_type
typedef NumericTraits< typename ValueType::value_type >::RealPromote | result_type
## Public Methods
result_type | operator() (const argument_type &a) const

## Detailed Description

### template<class ValueType>
class vigra::VectorNormSqFunctor< ValueType >

A functor for computing the squared vector norm.

Calculate the squared magnitude or norm from a given vector-valued entity. The vector type will typically be some sort of TinyVector.

At least, the vector type is required to have a function 'result`= dot(v,v)`'.

For an example of its usage see VectorNormFunctor

Traits defined:

`FunctorTraits::isUnaryFunctor` is true (`VigraTrueType`)``

See also:
  TinyVector, dot()

## Member Typedef Documentation

typedef ValueType argument_type

| the functor's argument type

typedef NumericTraits<typename ValueType::value_type>::RealPromote result_type

| the functor's result type

## Member Function Documentation

result_type operator() | ( | const argument_type & | a | ) | const`[inline]`

| calculate transform '`v1*v1 + v2*v2 + ...`'.

The documentation for this class was generated from the following file:

- vigra/transformimage.hxx

© Ullrich Köthe (koethe@informatik.uni-hamburg.de) Cognitive Systems Group, University of Hamburg, Germany | html generated using doxygen and Python VIGRA 1.3.2 (27 Jan 2005)