what is the difference between sym2poly and coeffs?

It seems them get a different vector elements order.... Anyone tell me the concrete distinction? thks!

Answer 1

[David Sanchez]

sym2poly is used when symbolic notation is used. Both return the coefficients of a polynomial.

You can read the help of each one to see the slight difference between them through the examples therein provided.

help sym2poly

help coeffs

[Azzi Abdelmalek]

they do not return the same result

Answer 2

[Azzi Abdelmalek]

syms x u 
%first example
y=x^3 - 2*x - 5
sym2poly(y)   % considere y as a polynome
ans =
   1     0    -2    -5
coeffs(y)  % considere y as any expression
ans =
[ -5, -2, 1]   % the coefficient 0 is omitted
% second example
y=x^2+3*u^3+25
coeffs(y)
ans =
[ 25, 1, 3]
sym2poly(y)
Error using sym/sym2poly (line 21)
Input has more than one symbolic variable.