年份 2001 2002 2003 2004 2005
产量 500.6 442.4 428.6 370.1 343.1
怎么用拟合把式子弄出来啊??

>> year=[2001 202 2003 2004 2005];
>> product=[500.6 442.4 428.6 370.1 343.1];
>> p=polyfit(year,product,1);
??? >> product=[500.6 442.4 428.6 370.1 343.1];
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Error: Unexpected MATLAB operator.
运行不了啊......