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deflection,force圖 &polyfit圖 

deflection = [ 0,0.09,0.18,0.28,0.37,0.46,0.55,0.65,0.74];
force = [ 0:100:800];
subplot(2,1,1)
plot(force,deflection,'o')
xlabel('Applied Force (lb)')
ylabel('Deflection (in.)')
axis([0 800 0 0.8])

p=polyfit(force,deflection,1);
k=1/p(1)
f=[0:2:800];
x=f/k;
subplot(2,1,2)
plot(f,x,force,deflection,'o')
xlabel('Applied Force (lb)')
ylabel('Deflection (in.)')
axis([0 800 0 0.8])

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