Class expval_scalar (o2scl)

O2scl : Class List

class expval_scalar : public o2scl::expval_base

Scalar expectation value.

See expval_base for some general notes on this and related classes.

This represents the expectation value of a scalar double-precision quantity over several measurements.

Report statistics

virtual void current_avg_stats(double &avg, double &std_dev, double &avg_err, size_t &m_block, size_t &m_per_block) const

Report current average, standard deviation, and the error in the average and include block information.

virtual void current_avg(double &avg, double &std_dev, double &avg_err) const

Report current average, standard deviation, and the error in the average.

virtual void reblock_avg_stats(size_t new_blocks, double &avg, double &std_dev, double &avg_err, size_t &m_per_block) const

Report average, standard deviation, and the error in the average assuming a new block size.

Idea for Future:

Use recurrence relation for averages here rather than dividing at the end.

virtual void reblock_avg(size_t new_blocks, double &avg, double &std_dev, double &avg_err) const

Report average, standard deviation, and the error in the average assuming a new block size.

Direct manipulation of the stored data

const ubvector &get_data() const

Return the current data for all blocks.

const double &operator[](size_t i_block) const

Return the current data for block with index i_block.

double &operator[](size_t i_block)

Return the current data for block with index i_block.

template<class vec_t>
inline void set_data(vec_t &v)

Set the data for all blocks.

void is_valid() const

Internal consistency check.

friend void hdf_output(o2scl_hdf::hdf_file &hf, expval_scalar &t, std::string name)

friend void hdf_input_n(o2scl_hdf::hdf_file &hf, expval_scalar &t, std::string &name)

Public Types

typedef boost::numeric::ublas::vector<double> ubvector

Public Functions

expval_scalar(size_t n_blocks = 1, size_t n_per_block = 1)

Create with n_blocks blocks and n_per_block points block.

virtual ~expval_scalar()

expval_scalar(const expval_scalar &ev)

Copy constructor.

expval_scalar &operator=(const expval_scalar &ev)

Copy constructor.

virtual void set_blocks(size_t n_blocks, size_t n_per_block)

Reset for n_blocks blocks and n_per_block points block.

virtual void free()

Free allocated data (but do not change the current values of n_blocks or n_per_block)

virtual void add(double val)

Add measurement of value val.

Public Members

double current

The current rolling average.

Protected Attributes

ubvector vals

The average for each block.

This is a vector of length nblocks.