polyfit 语句
x=[1 2 3 4 5];
y=[10 15 32 89 120];
z=[385 648 862 921 1025];
A=polyfit(x,y,4)
B=polyfit(y,z,4)
z1=polyval(A,x);
z2=polyval(B,y);
figure(1)
plot(x,y,'b*',y,z,'r+');
hold on
figure(2)
plot(x,z1,'b',y,z2,'r');
hold on
grid on
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