function y=tfenbu(m,n)
%本函数产生自由度为m,数据量为n的t分布。
%-----------------------------------
%
y=zeros(1,n);
if(floor(m/2)==m/2)
for i=1:m/2
[x1,x2]=gaussian(n);
for j=1:n
y(j)=x1(j)^2+x2(j)^2+y(j);
end
end
z=gaussian(n);
y=z./y;
else
for i=1:floor(m/2)
[x1,x2]=gaussian(n);
for j=1:n
y(j)=x1(j)^2+x2(j)^2+y(j);
end
end
[x,z]=gaussian(n);
for j=1:n
y(j)=y(j)+x(j)^2;
end
y=z./y;
end