Add example

0 - example/nsq - 恒虚警代码/stat_window.m

@@ -0,0 +1,11 @@
+function [ stat ] = stat_window(signal, win_size)
+    n = length(signal);
+    stat = zeros(n, 1);
+    for i = 1: n
+        for j = 1: win_size
+            if i + j - 1 <= n
+                stat(i, 1) = stat(i, 1) + signal(i + j - 1, 1);
+            end
+        end
+    end
+end