应该可以的!!!figure;x=[2005 2006 2007 2008 2009 2010];y7=[900 1000 1500 2300 2700 2800];a=polyfit(x,y7,4);xi=2005:1:2010;yi=polyval(a,xi);plot(x,y7,'go','MarkerEdgeColor','k','MarkerFaceColor','g','MarkerSize',6);xlabel('年份');ylabel('房地产景气指数');axis([2005 2010 800 3000])hold onplot(xi,yi,'linewidth',2,'mark...
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