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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!
% t% C9 B N) A0 F, c1 }s=zeros(1,5000);( Y5 Z& Q. l$ O
s=rand(1,5000);( L) D9 N5 c( O; Y" ^
n=length(s);1 M" Q* p, c4 k( Y& Y1 F/ W
max=0.0;
4 J- N5 F- [0 A/ V8 M: r ?( Vindex=0;
& H U; O( N8 ]7 m$ u ]+ Jfor i=1:n
u1 S/ i' f( K% A if max<s(i); S% R4 ?( a% W/ M# ~7 K
max=s(i);5 w9 X7 A) O: `4 b6 i
index=i; 0 L1 ~0 d' Y2 \% y
else+ q. c6 v! T$ ~9 u( D$ t" W
end4 \+ O7 d* f$ u, z: d
end # p6 q# n% I4 B) B' A
small=100;( N+ q8 k" a* ~& r9 E7 O- j
wenergys=sum(s(index-small:index+small).^2);- \: N7 Y8 ^& F* e' w
middle=150;+ L# q1 h/ p4 N) q3 R- C8 ~, X
wenergym=sum(s(index-middle:index+middle).^2);& x7 Y9 |9 |4 @9 w" f* k
large=200;
' R; n' Y/ t; K# K. U1 Owenergyl=sum(s(index-large:index+large).^2);2 n. p8 m; }4 A' }# d; J7 M7 w. J
energy=sum(s.^2);
; \4 {# O" z; ^' k+ `ratios=wenergys/energy;
2 |, V% n1 d* r1 x. w" ~2 }2 ]ratiom=wenergym/energy;% g5 h$ c+ k$ s5 N
ratiol=wenergyl/energy;2 K' Q/ k( b! b: S. {3 f
m=max*100000;
* |# a$ v" E7 Iws=wenergys*100000;
3 Z1 o, w& z/ o% e; \5 ?wm=wenergym*100000;! o" Z8 f+ l# {! J" f4 p
wl=wenergyl*100000;5 ]0 k% v% E4 w- G$ q7 E# u" H
e=energy*100000;1 H7 X6 f" y% D
a=[m,index,e,ws,wm,wl,ratios,ratiom,ratiol]; |
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