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clear;clc;
x1 = [1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7];
y1 = [0.41 0.416 0.446 0.473 0.5 0.524 0.547 0.57 0.589 0.612 0.627 0.648];
x1= linspace( 0, 7, 100) ; p1= polyfit ( x1 , y1, 4);   
z1= polyval( p1, x1) ; plot( x, y1, 'ob', x1, z1, 'b') , hold on;   

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??? Error using ==> polyfit
X and Y vectors must be the same size.
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p1= polyfit ( x1 , y1, 4);  
??? Error using ==> polyfit
X and Y vectors must be the same size.

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