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 coef(poly,deg[,var])

:: The coefficient of a polynomial poly at degree deg
with respect to the variable var (main variable if unspecified).
 return

polynomial
 poly

polynomial
 var

indeterminate
 deg

nonnegative integer

The coefficient of a polynomial poly at degree deg
with respect to the variable var.

The default value for var is the main variable, i.e.,
var(poly).

For multivariate polynomials, access to coefficients depends on
the specified indeterminates. For example, taking coef for the main
variable is much faster than for other variables.
[0] A = (x+y+z)^3;
x^3+(3*y+3*z)*x^2+(3*y^2+6*z*y+3*z^2)*x+y^3+3*z*y^2+3*z^2*y+z^3
[1] coef(A,1,y);
3*x^2+6*z*x+3*z^2
[2] coef(A,0);
y^3+3*z*y^2+3*z^2*y+z^3
 References

section
var
, section deg
, mindeg
.
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