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程序如下：
T=1978:1:2012;
t1=1978:1:2012;
五阶拟合函数是f5=0.0049664*T^5-49.4903*T^4+197266.7483*T^3-393146782.4823*T^2+391762509341.9921*T-156152262895446.5;
dc1=diff(0.0049664*T^5-49.4903*T^4+197266.7483*T^3-393146782.4823*T^2+391762509341.9921*T-156152262895446.5) %求导
dc2=(388*t1.^4)/15625-(6965140519951689*t1.^3)/35184372088832+(20334101580882327*t1.^2)/34359738368-(6595908489410563*t1)/8388608+6418636953059199/16384
%离散化
运行结果是：
dc1 =
(388*T^4)/15625 – (6965140519951689*T^3)/35184372088832 + (20334101580882327*T^2)/34359738368 – (6595908489410563*T)/8388608 + 6418636953059199/16384
dc2 =
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