How do I create an arbitrary polynomial with defined coefficient in vector form?

Hello! How do I create an arbitrary polynomial if we got the coefficients and the extent of the polynomial? We have the coefficients in a vector and the extent of the polynomial is a number. So we are unsure how to combine these two and to have a variable x (for example how do I write y = 2x + 5 if I have the coefficient [2 5]' and the extent is one?).

And we are doing this in MATLAB.

Answer 1

[dpb]

One way is

b= [2 5].';
x=1;
y=polyval(b,x);

[Daniel Brun]

Thanks! But can I use this method to get a arbitrary polynomial? For example if I want polynomial of degree n?

[Torsten]

http://de.mathworks.com/help/matlab/ref/polyval.html

Best wishes

Torsten.

[Daniel Brun]

Thank you! I understand it now

[dpb]

So, please Accept the answer...

I'll note it seems as if one should be able to use the Curve Fitting Toolbox cfit object, but it doesn't seem possible to load it with coefficients, only with data.