Class template lognormal

Class template lognormal_distribution

boost::random::lognormal_distribution

Synopsis

// In header: <boost/random/lognormal_distribution.hpp>

template<typename RealType = double> 
class lognormal_distribution {
public:
  // types
  typedef normal_distribution< RealType >::input_type input_type; 
  typedef RealType                                    result_type;

  // member classes/structs/unions

  class param_type {
  public:
    // types
    typedef lognormal_distribution distribution_type;

    // construct/copy/destruct
    explicit param_type(RealType = 0.0, RealType = 1.0);

    // public member functions
    RealType m() const;
    RealType s() const;

    // friend functions
    template<typename CharT, typename Traits> 
      friend std::basic_ostream< CharT, Traits > & 
      operator<<(std::basic_ostream< CharT, Traits > &, const param_type &);
    template<typename CharT, typename Traits> 
      friend std::basic_istream< CharT, Traits > & 
      operator>>(std::basic_istream< CharT, Traits > &, const param_type &);
    friend bool operator==(const param_type &, const param_type &);
    friend bool operator!=(const param_type &, const param_type &);
  };

  // construct/copy/destruct
  explicit lognormal_distribution(RealType = 0.0, RealType = 1.0);
  explicit lognormal_distribution(const param_type &);

  // public member functions
  RealType m() const;
  RealType s() const;
  RealType min() const;
  RealType max() const;
  param_type param() const;
  void param(const param_type &);
  void reset();
  template<typename Engine> result_type operator()(Engine &);
  template<typename Engine> 
    result_type operator()(Engine &, const param_type &);

  // friend functions
  template<typename CharT, typename Traits> 
    friend std::basic_ostream< CharT, Traits > & 
    operator<<(std::basic_ostream< CharT, Traits > &, 
               const lognormal_distribution &);
  template<typename CharT, typename Traits> 
    friend std::basic_istream< CharT, Traits > & 
    operator>>(std::basic_istream< CharT, Traits > &, 
               const lognormal_distribution &);
  friend bool operator==(const lognormal_distribution &, 
                         const lognormal_distribution &);
  friend bool operator!=(const lognormal_distribution &, 
                         const lognormal_distribution &);
};

Description

Instantiations of class template lognormal_distribution model a random distribution . Such a distribution produces random numbers with for x > 0.

	Warning
	This distribution has been updated to match the C++ standard. Its behavior has changed from the original boost::lognormal_distribution. A backwards compatible version is provided in namespace boost.

`lognormal_distribution` public construct/copy/destruct

```
explicit lognormal_distribution(RealType m = 0.0, RealType s = 1.0);
```
Constructs a lognormal_distribution. m and s are the parameters of the distribution.

explicit lognormal_distribution(const param_type & param);

Constructs a lognormal_distribution from its parameters.

`lognormal_distribution` public member functions

```
RealType m() const;
```
Returns the m parameter of the distribution.
```
RealType s() const;
```
Returns the s parameter of the distribution.
```
RealType min() const;
```
Returns the smallest value that the distribution can produce.
```
RealType max() const;
```
Returns the largest value that the distribution can produce.
```
param_type param() const;
```
Returns the parameters of the distribution.
```
void param(const param_type & param);
```
Sets the parameters of the distribution.
```
void reset();
```
Effects: Subsequent uses of the distribution do not depend on values produced by any engine prior to invoking reset.
```
template<typename Engine> result_type operator()(Engine & eng);
```
Returns a random variate distributed according to the lognormal distribution.
```
template<typename Engine> 
  result_type operator()(Engine & eng, const param_type & param);
```
Returns a random variate distributed according to the lognormal distribution with parameters specified by param.

`lognormal_distribution` friend functions

template<typename CharT, typename Traits> 
  friend std::basic_ostream< CharT, Traits > & 
  operator<<(std::basic_ostream< CharT, Traits > & os, 
             const lognormal_distribution & ld);

Writes the distribution to a std::ostream.

template<typename CharT, typename Traits> 
  friend std::basic_istream< CharT, Traits > & 
  operator>>(std::basic_istream< CharT, Traits > & is, 
             const lognormal_distribution & ld);

Reads the distribution from a std::istream.

friend bool operator==(const lognormal_distribution & lhs, 
                       const lognormal_distribution & rhs);

Returns true if the two distributions will produce identical sequences of values given equal generators.

friend bool operator!=(const lognormal_distribution & lhs, 
                       const lognormal_distribution & rhs);

Returns true if the two distributions may produce different sequences of values given equal generators.

Class template lognormal_distribution

Synopsis

Description

lognormal_distribution public construct/copy/destruct

lognormal_distribution public member functions

lognormal_distribution friend functions

`lognormal_distribution` public construct/copy/destruct

`lognormal_distribution` public member functions

`lognormal_distribution` friend functions