coef

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

non-negative 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 multi-variate 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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