HP 40G manual Loop functions, Matrix functions, Iterate, Recurse

Loop functions

	The loop functions display a result after evaluating an
	expression a given number of times.
ITERATE	Repeatedly for #times evaluates an expression in terms of
	variable. The value for variable is updated each time, starting
	with initialvalue.
	ITERATE(expression,variable,initialvalue,
	#times)
	Example
	ITERATE(X2,X,2,3) returns 256
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,term-n,term1,term2)
	Example
	RECURSE(U,U(N-1)*N,1,2)672?_￿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 12-9.

Using mathematical functions 10-11