sampler.h File Reference

The Sampler keeps a list of live points and replaces the worst live points in each iteration. More...

#include "common.h"
#include "draw.h"

Go to the source code of this file.

Data Structures
struct	draw_point
struct	ultranest_state

Functions
ultranest_state *	ultranest_sampler_init (LikelihoodFunc, const char *root, int ndim, unsigned int nlive_points, ultranest_draw_state *draw_state)
point *	ultranest_sampler_next (ultranest_state *state)
int	ultranest_sampler_integrate_remainder (ultranest_state *state, const double logwidth, const double logVolremaining, const double logZ, weighted_point *points)

Detailed Description

The Sampler keeps a list of live points and replaces the worst live points in each iteration.

Function Documentation

ultranest_state* ultranest_sampler_init	(	LikelihoodFunc	,
		const char *	root,
		int	ndim,
		unsigned int	nlive_points,
		ultranest_draw_state *	draw_state
	)

Create sampler.

Parameters

draw_state

state of the drawing method. Created with ultranest_draw_init See ultranest for documentation on the other parameters.

Uses ultranest_draw_generate_direct to initialise the first live points.

References ultranest_state::draw_state, ultranest_state::draws_file, point::L, ultranest_state::live_points, ultranest_state::Lmax, ultranest_state::ndim, ultranest_state::ndraws, ultranest_state::nlive_points, point::phys_coords, ultranest_state::remainderZ, ultranest_state::root, and ultranest_draw_generate_direct().

Referenced by ultranest().

int ultranest_sampler_integrate_remainder	(	ultranest_state *	state,
		const double	logwidth,
		const double	logVolremaining,
		const double	logZ,
		weighted_point *	points
	)

Integrate the current live points (remainder on the integral). Step integration is used.

Parameters

state	Sampler
logwidth	current point weight
logVolremaining	current remaining volume
logZ	current evidence
points	if given, stores the live points with weights into this array.

Returns

number of live points

References point::L, ultranest_state::live_points, ultranest_state::Lmax, ultranest_state::nlive_points, ultranest_state::remainderZ, and ultranest_state::remainderZerr.

Referenced by ultranest().

point* ultranest_sampler_next

(

ultranest_state *

state

)

Next sampler iteration. Will remove least likely point and find a higher replacement, using the drawing method.

Uses ultranest_draw_next

References point::coords, ultranest_state::draw_state, ultranest_state::draws_file, point::L, ultranest_state::live_points, ultranest_state::Lmax, ultranest_state::ndim, ultranest_state::ndraws, ultranest_state::nlive_points, point::phys_coords, and ultranest_draw_next().

Referenced by ultranest().