# plotting a polynomial function

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How can I plot a polynomial function in MATLAB? for example:

89.9659+0.1110371T-0.001472155T^2+ 1.1E-5T^3-4.381E-8T^4+1E-10T^5

##### 0 Comments

### Accepted Answer

mohammad
on 18 Jun 2012

Edited: Walter Roberson
on 23 Oct 2023

##### 3 Comments

Morne' Breitenbach
on 5 Jun 2020

### More Answers (5)

Rubén Lumbiarres
on 13 Sep 2018

Edited: Walter Roberson
on 15 Sep 2018

x=-5:.1:5;

p=[1 -1 -11 9 18] % polynomial function

plot(x,polyval(p,x))

grid on

##### 1 Comment

Brian Trease
on 24 Nov 2020

Thanks!

I made it one step easier, with no need to specify spacing...

fplot(@(x) polyval(p,x), [-5 5])

grid on

Fangjun Jiang
on 14 Dec 2011

Of course ezplot(), but you need to fix your formula.

ezplot('89.9659+0.1110371*T-0.001472155*T^2+ 1.1E-5*T^3-4.381E-8*T^4+1E-10*T^5')

Walter Roberson
on 14 Dec 2011

Edited: Walter Roberson
on 23 Oct 2023

You are asking to plot data that has a range of about 10^10 at one end, and about 10^20 at the other end. What are you expecting to see of interest?

T=linspace(100,1000,100);

p=89.9659+0.1110371*T-0.001472155*T.^2+ 1.1E-5*T.^3-4.381E-8*T.^4+1E-10*T.^5;

plot(T,p)

##### 2 Comments

Fangjun Jiang
on 14 Dec 2011

No. Because you have small coefficients, the range of p is not from 10^2 to 10^20. The maximum value of p is around 7e4.

The point is, you can specify any range of T as you want, use linspace() or 100:100:1000, then use array power ".^" not the matrix power "^" to evaluate p, and then you can use plot().

Ch
on 4 Sep 2022

x=-5:.1:5;

p=[1 -1 -11 9 18] % polynomial function

plot(x,polyval(p,x))

grid on

##### 0 Comments

Pink_panther
on 23 Oct 2023

%solve1

fplot(@(x)89.9659+0.1110371.*x-0.001472155.*x.^2+1.1E-5.*x.^3-4.381E-8.*x.^4+1E-10.*x.^5)

##### 0 Comments

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