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- clc
- clear
- close
- k=[0:1:5];
- xk=[-2,-1,3,4,7,7.5];
- yk=[-1,-3,1,2,1,0.5];
- x=[-2:0.01:7.5];
- a=polyfit(xk,yk,length(xk)-1)
- y1=polyval(a,x)
- figure
- plot(xk,yk,'b*',x,y1)
- hold on
- yk(6)=-2
- b=polyfit(xk,yk,length(xk)-1)
- y2=polyval(b,x)
- plot(xk,yk,'r*',x,y2)
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