I have an polynomial f(x) = 4x^5 + 5x^4 + 2x^3 +2x^2 +3x. And x ranges from {0 to 63}. How do I code this so I can display answer corresponding to every value of x.?

Could you help me?

Answer 1

[Torsten]

p=[4 5 2 2 3 0];
x0=1;
polyval(p,x0);

evaluates your polynomial at x0=1.

Best wishes

Torsten.

[Guillaume]

Note that in Torsten example x0 could be a vector or matrix

polyval(p, [1 2 3]) %evaluate polynomial at x = 1, x = 2 and x = 3

[Neha W]

Thank you.

[Neha W]

Sir/Mam, but I need to evaluate that polynomial from x = 0 to 63. Then should I define that x vector as [0 1 2 3 4 5 6... 63]?

[Torsten]

Set

p=[4 5 2 2 3 0];
x0=linspace(0,63,64);
f0=polyval(p,x0);

Best wishes

Torsten.

[Neha W]

Thank you for your help.

[Guillaume]

Well,

x0 = 0:63;

would be simpler than linspace

Answer 2

[Fazleh Rabbi]

(a) Write down MATLAB command for each of the following polynomials.

(i) 2x

2

- 5x

4+ 8x (ii) 2x

5 + sin 40