get_interior_distance_to_hull - Determines the distance of an interior point to hull


#include "h/h_misc.h"

Example compile flags (system dependent):
   -L/home/kobus/misc/load/linux_x86_64_opteron -L/usr/lib/x86_64-linux-gnu
  -lKJB                               -lfftw3  -lgsl -lgslcblas -ljpeg  -lSVM -lstdc++                    -lpthread -lSLATEC -lg2c    -lacml -lacml_mv -lblas -lg2c      -lncursesw 

int get_interior_distance_to_hull
	const Hull *hp,
	const Vector *test_vp,
	double *distance_ptr


This function computes the distance of a point to a hull boundary on the assumption that the point is inside the hull. If the point is in fact outside the hull, then the distance will be set to a negative value, which has no meaning other than the point is outside the hull. If the distance of an exterior point to the hull is needed, then use the function get_distance_to_hull which computes both. The first argument "hp" is the address of the convex hull The second argument "test_vp" contains the address of a the query location. The argument distance_ptr is a pointer to the distance to be computed.


NO_ERROR on success, and ERROR on failure with an error message being set. Note that it is not an error to query about a point that is outside the hull. The negative distance is a valid indicator of this, and is useful for some calling routines.


If the point is outside the hull, then the distance will be negative, but the magnitude of the negative distance has no meaning. The distance from an exterior point to the hull is NOT computed--use get_distance_to_hull() for that.


The point of using this routine instead of get_distance_to_hull() is that this one is faster and generalizes to all dimensions. Hence if the extra flexibility of get_distance_to_hull() is not required, then use this routined.


The sense (sign) of the distance is the opposite of that computed by get_distance_to_hull().


Hull, get_distance_to_hull


This software is not adequatedly tested. It is recomended that results are checked independantly where appropriate.


Kobus Barnard


Kobus Barnard


get_distance_to_hull , expand_hull , get_approximate_error_hull_data , trim_2D_hull