Getting started with an assignement

a )

Plot the measuret data. Plot a parabola, that are pretty close to the measuret data - use fx p=(-0.4 , 0.2 ,-0.015). Calculate the sum of the squares of the deviation of the measuret data and the fit. Optimize p manuelly if needed.

data:

x: 2,3,4,5,6,7,8,9,10,11,12

y: 0.01,0.03,0.07,0.13,0.19,0.23,0.21,0.16,0.09,0.04,0.02

f(x)= p_3*x^2+p_2*x+p_1

Anyone who can help, I am having trouble with this one

Answer 1

[Star Strider]

Take a look at the documentation for polyfit. Everything on that page should get you started, including evaluating the polynomial and plotting it. Be sure to scroll all the way through to the end of the page. There are links there to a number of related MATLAB functions you will find useful.

[Rasmus]

I am still having trouble getting it to work properly. I can't plot the poly and i dont really see why, as i follow instructions etc.

[Rasmus]

Nevermind, i made it work :)

[Star Strider]

Great!