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what is the difference between sym2poly and coeffs?

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Li
Li 2013-5-30
It seems them get a different vector elements order.... Anyone tell me the concrete distinction? thks!

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回答（2 个）

David Sanchez
David Sanchez 2013-5-30
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
Azzi Abdelmalek 2013-5-30
编辑：Azzi Abdelmalek 2013-5-30
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.

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