function [ bestOfArray ] = bestOfArray( array, num )

%bestOfArray Returns array of the same size with all but the top num items

%reduced to zero

sorted = sort(array,'descend');

bestOfArray = zeros(size(array,1), size(array,2));

for i = 1:num

    keep = (array == sorted(i));

    bestOfArray = bestOfArray + keep .* array;

end

end