I'm trying to take data and plot it then fit a curve that is of the form f(x) = p1*x^2 + p2*x + p3, but with p2 equal to zero. Right now my code fits for p1, p2, and p3. How can I set p2 to zero and allow it only to fit p1 and p3? Please see the code and results below. Thank you!
Code:rho=Resistivityohmcm;T=TemperatureK;plot(T,rho,'-o')f=fit(T,rho,'poly2');plot(f,T,rho)disp (f)Results: Gives the correct plot and the values for f:Linear model Poly2: f(x) = p1*x^2 + p2*x + p3 Coefficients (with 95% confidence bounds):
p1 = 1.511e-07 (1.422e-07, 1.599e-07) p2 = -2.127e-05 (-2.512e-05, -1.743e-05) p3 = 0.001779 (0.001383, 0.002175)
Best Answer