>> y22=polyval(a,68397.8486)
y22 =
4.2857e+04
>> y23=polyval(a,72522.1234)
y23 =
4.6045e+04
>> y25=polyval(a,76589.56346)
y25 =
5.1010e+04
>> 粮食产量和农业劳动力 >>
y0=[38728,40731,37911,39151,40208,39408,40755,44624,43529,44264,45649,44510,46662,50454,49417,51230,50839,46218,45264,45706,4307,46947,48402,49804,50160]; >>
x0=[31151,30868,31130,31254,31663,32249,33225,38914,39098,38699,37680,36628,35530,34820,34840,35177,35768,36043,36513,36870,36546,35269,33970,32561,31444]; >> a=ployfit(x0,y0,3) a =
1.0e+06 *
0.0000 -0.0000 0.0008 -8.8937
>> y1=polyval(a,31151) y1 =
3.9866e+04
>> y2=polyval(a,30868) y2 =
3.7223e+04
>> y3=polyval(a,31130) y3 =
3.9685e+04
>> y4=polyval(a,31254) y4 =
4.0723e+04
>> y5=polyval(a,31663) y5 =
4.3602e+04
>> y6=polyval(a,32249) y6 =
4.6404e+04
>> y7=polyval(a,33225) y7 =
4.8220e+04
>> y8=polyval(a,38914) y8 =
4.3641e+04
>> y9=polyval(a,39098) y9 =
4.4561e+04
>> y10=polyval(a,38699)
y10 =
4.2746e+04
>> y11=polyval(a,37680)
y11 =
4.0781e+04
>> y12=polyval(a,36628)
y12 =
4.1687e+04
>> y13=polyval(a,35530)
y13 =
4.4297e+04
>> y14=polyval(a,34820)
y14 =
4.6145e+04
>> y15=polyval(a,34840)
y15 =
4.6096e+04
>> y16=polyval(a,35177)
y16 =
4.5237e+04
>> y17=polyval(a,35768)
y17 =
4.3666e+04
>> y18=polyval(a,36043)
y18 =
4.2966e+04
>> y19=polyval(a,36513)
y19 =
4.1908e+04
>> y20=polyval(a,36870)
y20 =
4.1287e+04
>> y21=polyval(a,36546)
y21 =
4.1843e+04
>> y22=polyval(a,35269)
y22 =
4.4994e+04
>> y23=polyval(a,33970)
y23 =
4.7808e+04
>> y24=polyval(a,32561)
y24 =
4.7334e+04
>> y25=polyval(a,31444)
y25 =
4.2161e+04