List Functions; Loop Functions - HP 39gs User Manual

EXP
EXPM1
LNP1

List functions

Loop functions

ITERATE
RECURSE
13-10
Natural exponential. This is more accurate than
to limitations of the power function.
EXP(value)
Exponent minus 1 :
EXP when x is close to zero.
EXPM1(value)
Natural log plus 1 : ln(x+1). This is more accurate than
the natural logarithm function when x is close to zero.
LNP1(value)
These functions work on list data. See "List functions" on
page 16-6.
The loop functions display a result after evaluating an
expression a given number of times.
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
2
ITERATE(X ,X,2,3) returns 256
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
Example
RECURSE(U,U(N-1)*N,1,2)
Stores a factorial-calculating function named U1.
When you enter U1(5), for example, the function
calculates 5! (120).
x
e – 1
. This is more accurate than
, term
n
Using mathematical functions
x
e
due
, term )
1 2
U1(N)