CoefficientList

CoefficientList[poly, var] gives a list of coefficients of powers of var in poly, starting with power 0.

CoefficientList[poly, , , ... ] gives an array of coefficients of the .

Example: CoefficientList[x^2 + 2 x y - y, x, y] .

The dimensions of the array returned by CoefficientList are determined by the values of the Exponent[poly, ].

Terms that do not contain positive integer powers of a particular variable are included in the first element of the list for that variable.

CoefficientList always returns a full rectangular array. Combinations of powers that do not appear in poly give zeros in the array.

CoefficientList[0, var] gives {}.

CoefficientList works whether or not poly is explicitly given in expanded form.

See The Mathematica Book: Section 3.3.2.

See also: Series, SeriesCoefficient, Collect, FactorList.

Further Examples