How to plot a polynomial of which I have coefficient vector?

I have only coefficient: how to plot it?

Answer 1

[Walter Roberson]

t = linspace(-10,10);  %adjust as needed
plot(t, polyval(a, t));  % where a is coefficients of a polynomial

Answer 2

[madhan ravi]

fplot(poly2sym(a)) % where a is coefficients of a polynomial

Answer 3

[Jyotish Robin]

Hi Luigi,

Hopefully, the command 'fplot' can be helpful. For example,

a=[1 2 3]; % coefficients 
fplot(@(x) a(1)*x+ a(2)*(x .^2)+a(3)*(x.^3))

will plot a polynomial function in x.

Hope this helps!

Thanks,

Jyotish

Answer 4

[Timothy Simon Thomas]

Config

s=10
t=[-s:0.00001:s];
x=t;

Parameters

a=1
b=-6
c=11
d=-6

Equation

fx=(a*(x.^3)) + (b*(x.^2)) + (c.*x) + d;
syms x1
fx1=(a*(x1.^3)) + (b*(x1.^2)) + (c.*x1) + d;
solve(fx1==0,x1)

Plotting

plot(t,fx)
axis([-s,s,-s^2,s^2])

Draw Axes

line([0 0],[-s^2 s^2])
line([-s s],[0 0])
title('Cubic and lower Polynomial Visualiation')