List Functions; Loop Functions - HP 39gII User Manual

numer
denom

List functions

Loop functions

ITERATE
Σ
170
Simplified Numerator. For the integers a and b, returns
the numerator of the fraction a/b after simplification.
numer(a/b)
Example:
numer(10/12) returns 5.
Simplified Denominator. For the integers a and b, returns
the denominator of the fraction a/b after simplification.
denom(a/b)
Example:
denom(10/12) returns 6.
These functions work on list data. See the chapter Lists for
details.
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:
,X,2,3) returns 256
2
ITERATE(X
Summation. Finds the sum of expression with respect to
variable from initialvalue to finalvalue.
(expression, variable, initialvalue, finalvalue)
Σ
Example:
,x,1,5) returns 55.
Σ(x
2
Using mathematical functions