HP 39g Graphing Calculator Podręcznik Użytkownika Pobierz pdf (Strona 147)

Using mathematical functions 10-11

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(X

2

,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)

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,C

2

) returns 55.

Matrix functions

These functions are for matrix data stored in matrix variables.

See “Matrix functions and commands” on page 12-9.

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