www.pudn.com > C-C.rar > G_P.m, change:2004-07-29,size:1296b

```function [ln_r,ln_C]=G_P(data,N,tau,min_m,max_m,ss)
% the function is used to calculate correlation dimention with G-P algorithm
% data:the time series
% N: the length of the time series
% tau: the time delay
% min_m:the least embedded dimention m
% max_m:the largest embedded dimention m
% ss:the stepsize of r
%skyhawk
for m=min_m:max_m
Y=reconstitution(data,N,m,tau);%reconstitute state space
M=N-(m-1)*tau;%the number of points in state space
for i=1:M-1
for j=i+1:M
d(i,j)=max(abs(Y(:,i)-Y(:,j)));%calculate the distance of each two
end                                %points in state space
end
max_d=max(max(d));%the max distance of all points
d(1,1)=max_d;
min_d=min(min(d));%the min distance of all points
delt=(max_d-min_d)/ss;%the stepsize of r
for k=1:ss
r=min_d+k*delt;
C(k)=correlation_integral(Y,M,r);%calculate the correlation integral
ln_C(m,k)=log(C(k));%lnC(r)
ln_r(m,k)=log(r);%lnr
fprintf('%d/%d/%d/%d\n',k,ss,m,max_m);
end
plot(ln_r(m,:),ln_C(m,:));
hold on;
end
fid=fopen('lnr.txt','w');
fprintf(fid,'%6.2f %6.2f\n',ln_r);
fclose(fid);
fid = fopen('lnC.txt','w');
fprintf(fid,'%6.2f %6.2f\n',ln_C);
fclose(fid);```