parzen_bin.m

模式识别中Parzen窗函数的实现

%window function: Binomial distribution  func.
%
% (C)2008 TangSheng
%
%---------二项分布窗函数------------%
function parzen_bin(XX,YY,ZZ,Xi,n,nn,h1)
hn = h1/sqrt(n);
Vn = hn*hn;
for i = 1:sqrt(nn)
    for j = 1:sqrt(nn)
        ZZ(i,j) = 0;
    end
end
        
for i = 1:sqrt(nn)
    for j = 1:sqrt(nn)
          sum = 0;
        for k =1:n
            if (sqrt((XX(i,j)-Xi(k,1))^2+(YY(i,j)-Xi(k,2))^2))<=(hn/2)
            sum =sum+1;
            end
        end
        ZZ(i,j) = sum/n;
    end
end
mesh(XX,YY,ZZ);
name = ['Parzen二项窗估计：','N=',num2str(n),', h1=',num2str(h1)];
title(name);
end