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下面是我编的M文件的程序,主要是求一维数组s的最大值和索引位置,然后加不同宽度的窗,求出窗里信号能量后与总能量求比值。我编的程序中s是小波包分析的高频信号,为了简化程序段,我用5000个随机数来代替。编译的时候for循环好像根本就没有执行,不知道是为什么。请前辈们帮忙看看,不胜感激!
9 I" v+ l4 C3 X+ U) Ps=zeros(1,5000);' c, J* _' I6 i7 E M! F1 f, K) o9 W
s=rand(1,5000);
2 l2 n0 ], F1 B, S) N# a4 Hn=length(s);3 M+ M3 v6 e! k; b' R
max=0.0;. ]' ? p7 E( j- H5 E
index=0;
" p; {. _( A( t: z$ Lfor i=1:n
4 k$ R9 |4 y& ~" O if max<s(i)
4 H' T4 G3 K9 N. T max=s(i);
% O/ i$ o% m. \2 w4 \ index=i; & H! A% l; Z& K! H1 b) x& _
else; F2 b; n- S- H U0 S
end
5 \ n7 U% |( X0 Z4 Q: p2 _end & R* K$ v7 A/ e5 c( s
small=100;
% T# G1 [' M6 ywenergys=sum(s(index-small:index+small).^2);2 ~! B1 Y" n$ E- \/ `5 b
middle=150;" {5 `4 {/ `+ O5 [8 I* g: K
wenergym=sum(s(index-middle:index+middle).^2);+ ^* o: ?1 E- T5 A7 L& @! O
large=200;
# D( |0 J9 W8 q: E4 j3 x4 ?* J4 Lwenergyl=sum(s(index-large:index+large).^2);
, r8 d( N( l" m" w8 T! t. E8 ]+ ^' nenergy=sum(s.^2);
7 J1 ]" ]0 S' |% q; [# Z# i: Qratios=wenergys/energy;) |* O8 s2 E0 p# t, A4 _( |3 g- w
ratiom=wenergym/energy;3 T9 X1 l; U% a
ratiol=wenergyl/energy;
* C7 ?/ `7 P2 {: ?: h: K9 w. d: `m=max*100000;0 X3 u- l4 U+ p
ws=wenergys*100000;, w5 `6 w( y2 M% @1 Q) l7 }" I
wm=wenergym*100000;# X, Q# q0 {+ R: ?: W" d
wl=wenergyl*100000;; U" j: y+ [. u9 H0 O
e=energy*100000;+ Q% Q6 K! z8 g9 K% @3 v* V0 l
a=[m,index,e,ws,wm,wl,ratios,ratiom,ratiol]; |
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