RandVector

PURPOSE

Selects and element from a discrete probability distribution.

SYNOPSIS

function i=RandVector(v)

DESCRIPTION

   Selects and element from a discrete probability distribution.

   Returns an element at random using the (absolute) values of the input 
   vector as selection weights.

CROSS-REFERENCE INFORMATION

This function calls:

rand Random state from a discrete belief.
rand Random state from a belief.
rand Generates random points on a GMixture.
rand Generates random ponts on a Gaussian.
rand Random state from a continuous space.
rand Random state from a discrete space.

This function is called by:

Prediction Belief evolution under the given action.
Prediction Belief evolution under the given action.
rand Random state from a discrete belief.
Update Belief evolution under an observation model.
rand Random state from a belief.
rand Generates random points on a GMixture.
SimulationStep Executes one step of a POMDP simulation.

SOURCE CODE

0001 function i=RandVector(v)
0002 %   Selects and element from a discrete probability distribution.
0003 %
0004 %   Returns an element at random using the (absolute) values of the input
0005 %   vector as selection weights.
0006 
0007   va=abs(v);
0008 
0009   r=rand*sum(va);
0010   i=1;
0011   s=va(i);
0012   while s<r
0013     i=i+1;
0014     s=s+va(i);
0015   end