How to create symbolic polynomial with specific vector of coefficients of symbolic variables in MatLab? - poly2sym -- MatLab

How to create symbolic polynomial  with specific vector of coefficients of symbolic variables in MatLab? - poly2sym -- MatLab

How to create symbolic polynomial  with specific vector of coefficients of symbolic variables in MatLab?

[Ans]

poly2sym

[description]

sym coeefficients -> poly

more details on:

Create symbolic polynomial from vector of coefficients - MATLAB poly2sym (mathworks.com)

code:

clear

clc

syms a b c d

p = poly2sym([a, b, c, d])

fprintf("1\n");

p = poly2sym(sym([1/2, -1/3, 1/4]))

fprintf("2\n");

p = poly2sym([0.75, -0.5, 0.25])

fprintf("3\n");

syms a b c d t

p = poly2sym([a, b, c, d], t)

fprintf("4\n");

p1 = subs(p, t, t^2 + 1)

p2 = subs(p, t, exp(t))

fprintf("5\n");

result:

p =

a*x^3 + b*x^2 + c*x + d

1

p =

x^2/2 - x/3 + 1/4

2

p =

(3*x^2)/4 - x/2 + 1/4

3

p =

a*t^3 + b*t^2 + c*t + d

4

p1 =

d + a*(t^2 + 1)^3 + b*(t^2 + 1)^2 + c*(t^2 + 1)


p2 =

d + c*exp(t) + a*exp(3*t) + b*exp(2*t)

5