what is the difference between sym2poly and coeffs?
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It seems them get a different vector elements order.... Anyone tell me the concrete distinction? thks!
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Answers (2)
David Sanchez
on 30 May 2013
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
on 30 May 2013
Edited: Azzi Abdelmalek
on 30 May 2013
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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