HP 39g+ Graphing manual Matrix functions, Polynomial functions, Polycoef

RECURSE	Provides a method of defining a sequence without using
	the Symbolic view of the Sequence aplet. If used with
	(“where”), RECURSE will step through the evaluation.
	RECURSE(sequencename, termn, term1, term2)
	Example
	RECURSE(U,U(N-1)*N,1,2)	U1(N)
	Stores a factorial-calculating function named U1.
	When you enter U1(5), for example, the function
	calculates 5! (120).
Σ	Summation. Finds the sum of expression with respect to

variable from initialvalue to finalvalue. Σ(variable=initialvalue, finalvalue, expression)

Example

Σ(C=1,5,C2) returns 55.

Matrix functions

	These functions are for matrix data stored in matrix
	variables. See “Matrix functions and commands” on
	page 13-9.
Polynomial functions
	Polynomials are products of constants (coefficients) and
	variables raised to powers (terms).
POLYCOEF	Polynomial coefficients. Returns the coefficients of the

polynomial with the specified roots. POLYCOEF ([roots])

Example

To find the polynomial with roots 2, –3, 4, –5:

POLYCOEF([2,-3,4,-5]) returns[1,2,-25,

-26,120], representing x4+2x3–25x2–26x+120.

11-10 Using mathematical functions