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柒.smilence

真正的坚定,就是找到力量去做自己喜欢的事情,并为之努力,这样才会觉得生活是幸福的。

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2010-03-17 18:55:04| 分类：研一下 | 标签： |举报 |字号大中小订阅

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%2010-03-17
%Qi.revresbo at #503
clc
clear all
close all

N = 100;
randn('state',0);
x = randn(1,N);
for i = 1:N
r(i) = sum(x(i:N).*x(1:(N-i+1)));
end

figure
plot([-(N-1):-1],r(N:-1:2));
hold on
plot([0:N-1],r);

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