myresignal.m

来自「matlab 时频分析上面程序第八章的故障诊断的小程序」· M 代码 · 共 42 行

function X=myresignal(data,tau)
%该函数用来对奇异值反变换后的矩阵进行平均
% tau为时间延迟
% data为输入矩阵,是n*M维矩阵
% X 为输入时间序列，
[n,m]=size(data);   %%%% n为重构的相空间维数，m为相空间中点的个数
T=m+(n-1)*tau;      %%%% T为原始信号长度
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 
 data1=zeros(n,T);  %%%重构n*T的矩阵，以便对对应元素求平均
 n2=1;
 n3=1;
 for n1=1:n
     data1(n2,n3:(n3+m-1))=data(n2,:);
     n2=n2+1;
     n3=n3+tau;
 end

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 
  for nn1=1:T   %%%%对重构的n*T矩阵对应元素求平均
     data2=data1(:,nn1);
     datasum=sum(data2);
     if nn1<=(n-1)*tau
         A2=ceil(nn1/tau);
     elseif nn1<=m
         A2=n;
     else
         A2=ceil((T-nn1+1)/tau);
     end
         X(nn1)=datasum/A2;
 end
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %for nn1=1:T  %%%对每列的非零元素求平均，存在一定的缺陷。
  %   data2=data1(:,nn1);
  %  datasum=sum(data2);
  %   A2=find(data2);
  %  A3=length(A2);
  % X(nn1)=datasum/A3;
  % end