我认识，我可以帮你问问

USDCNY0=xlsread ('C:\Users\Administrator\Desktop\Book1.xlsx',1,'B2:B21');
EURCNY0=xlsread ('C:\Users\Administrator\Desktop\Book1.xlsx',1,'C2:C21');
USDCNY=flipud(USDCNY0)/100;
EURCNY=flipud(EURCNY0)/100;
figure;
plot(USDCNY,'b');
hold on;
plot(EURCNY,'r');
xlabel('days'),ylabel('exchange.rates');
title('USDCNY(EURCNY) during the year2016');
hold off;
figure;
subplot(2,2,1);
autocorr(USDCNY);
subplot(2,2,2);
parcorr(USDCNY);
subplot(2,2,3);
autocorr(EURCNY);
subplot(2,2,4);
parcorr(EURCNY);
m1=ar(USDCNY,2);
m2= ar(EURCNY,2);
U0=predict(m1, USDCNY);
E0= predict(m2, EURCNY);