Re: Linear Regression

[Marco Atzeri]

Am 08.12.2018 um 10:14 schrieb LucaLuca:
> hi,
>
> i don't understand
>
> if i want to get this line :
>
> https://gyazo.com/942676a11228bc3c610419faa0867bc7
>
>
> how can i do it? :(

Luca,
I understand that learning a new language is difficult, but it seems
you need to follow some tutorial for the basis.
Almost all your questions are very elementary.


polyfit provides the coefficients of N grade polinomial
that fit the data.

For grade 1 the polinomial is m*x+c so

 yi =polyfit(b',a',1)
yi =

  -0.90000   5.94444

where yi(1) is "m" and yi(2) is "c"

and the Y of the given line for the same x data will be

y=b*yi(1)+yi(2)
y =

 Columns 1 through 8:

   5.04444   4.14444   3.24444   2.34444   1.44444   0.54444  -0.35556
-1.25556

 Column 9:

  -2.15556

and you can plot the data and the line together with

 plot(b,a,b,y)

I hope that this is enough to clarify you the matter

Regards
Marco

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