i am new to matlab and i want to learn, can anyone help me with this please!!!!

I want to compute and plot the regression polynomial of degree 2 for some datapoints and than I want to estimate the value of the function at the point x¯ = 2.5 by using the obtained regression polynomial of degree 2

[Torsten]

https://de.mathworks.com/help/matlab/ref/polyfit.html

[John D'Errico]

Since this is surely a homework problem, what have you tried? Why not use polyfit? If you have no idea how to use that tool, and cannot read the help, then you need to read the manuals. Spend some time with the various tutorials. The point being, there are plenty of simple tutorials to be found, and what you are asking for is already written up in the help.

[Anas Gharsa]

actually it is kind of practice for me it is not a home work!! like i said i am new to this!! all i am asking is some direction. however thank you for the answer

Answer 1

[Image Analyst]

See my attached demo for polyfit. It will be easy for you to adapt it.

coefficients = polyfit(x, y, 2);
yFit = polyval(coefficients, 2.5);

[Anas Gharsa]

thank you so much!! that would help me