%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Siddhartha Kasivajhula
% PSYCH 221/ EE 362 (Winter 2007-2008)
% Final Project: A Probabilistic Model of the Visual System
% 
% GenerateScene.m
% REPRESENTATION OF A SCENE
%
% A scene is modeled as a set of features, each of which is
% represented as a vector of zeros with a 1 at an index
% corresponding to the feature that is present in the scene
% For example, if we have 10 possible features, then
% f_i = [0 0 0 1 0 0 0 0 0 0] represents feature #4.
%
% This "function" generates a scene, in accordance with the definition
% above.
%
% Arguments are:
% NUM_FEATURES is the size of the feature space, i.e. the total number of
% features available.
%
% scene_features is a vector of features contained in the scene (feature
% indices, not feature vectors)
% Ex: scene_features = [1 4 6 7 9 10] means features 1, 4, 6, 7, 9, and 10
% are present in the scene.
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

function scene = GenerateScene(NUM_FEATURES, scene_features)

% uniquely represent all possible features as vectors
all_features = eye(NUM_FEATURES);

scene = [];
for i=1:size(scene_features, 2)
    scene = [scene; all_features(scene_features(i), :)];
end