MATLAB 小波分析源程序（可用） 简要注释

758988324

新手学习，感谢楼主，特别棒！！！加油哈哈

pkuzhh

看看你的代码，什么样子的？

爱学习的小牛

suntyao

{:5_250:}

累到飞起

前来学习，谢谢！

17718111737

查看本帖隐藏内容

Esteller

谢谢楼主分享，楼主真是好人啊啊啊啊啊

lvkeke

好东西，学习一下

lhb3047

% This is for power spectrum analysis.
clear;
load QR_jp0302;
for i=1:12:1200  
     jpn(i)=sum(QR_jp0302(i:i+11))/12;
%     jpn(i)=yjp(i);
end
   for j=1:100
       x(j)=jpn(12*(j-1)+1);
   end
y = fft(x);  %Fourier transform, default length = N
N = length(y);
y(1) = [];
power = abs(y(1:N/2)).^2;  
nyquist = 1/2;               
freq = (1:N/2)/(N/2)*nyquist;
period = 1./freq;
[mp,index] = max(power);
period(index);
[pxx,k]=psd(x,100,100,hanning(100),50,0.95,'none');
pxxgj=pxx.*((7.815+9.488)/2/3.5); psum=0;
%pxxgj=pxx.*((6.251+7.779)/2/3.5); psum=0; % alfa=0.10, r=3.5 freedum,
for i=1:length(pxx);psum=psum+pxxgj(i);end;
pxxc=psum/length(pxx); % 5% of Avg. PS line!
%[pzq,f] = periodogram(x,hanning(50),50,50-1);

subplot('position',[0.1 0.73 0.65 0.25])
plot(period,power,'r'),%axis([0 20 0 2e2])
xlabel('Period(/Years)')
ylabel('Power')
%title('Periodogram')
   
subplot('position',[0.1 0.40 0.65 0.25])%Plot Periodgram
plot(freq,power,'b') % ,grid on
%plot([0 freq],pzq,'b') % ,grid on
ylabel('Power')
xlabel('frequence')
hold on
%plot(freq,0.05*sum(power),'k-.')
hold off

%Plot PSDgram
subplot('position',[0.1 0.07 0.65 0.25])
plot(k,pxx,'m')%,axis([0 25 0 1]) % ,grid on
ylabel('Power Spectrum')
xlabel('Wave Number')
hold on
plot(xlim,pxxc+[0,0],'k:')
%plot(k,pxx(index+1)/(index+1),'r--')
hold off

rtzssb

谢谢楼主凤翔