HP 49g Graphing Calculator - Manual (Page 90)

List Manipulations
The following functions provide ways to manipulate the elements of a list:
Function Description
Q (MTHl LIST SORT Sorts the elements in a list in ascending order. In RPN
mode, the list must be on level 1.
0 (MÌB) LIST EEVLIST Reverses the order of the elements in a list. In RPN
mode, the list must be on level 1.
0 (PRGI l IST ELEMENTS
HEAD
Returns the first element in the list. In RPN mode, the
list must be on level 1.
0 (@G) list elements tail Returns a list of all the elements in the list except the
first element. In RPN mode, the list must be on
level 1.
0 (re) LIST ELEMENTS GET Returns the element in the list (argument 1/level 2) cor­
responding to a specified position (argument 2/leveI 1).
For example, GET({ 1 , 4 , 7 , 8 } , 3) returns 7, since 7 is
the third element in the list.
0 (ire) LIST ELEMENTS GETI Similar to the GET command (see above) but also
returns the specified position number incremented by 1
(and the original list). For example, GETI({ 1 , 4 , 7 , 8 } ,
3) returns
{ 1, 4, 7, 8}, 4 (the specified position number
+ 1), and 7 (the third element in the list).
0 (re) LIST ELEMENTS PUT Replaces an element at a particular position (argument
2/level 2) of a list (argument 1/level 3), with a new ele­
ment (argument 3/level 1). For example,
PUT({ 1, 2, 3),
2, 5) returns { 1, 5, 3}.
0
(00
LIST ELEMENTS PUTÌ Similar to the PUT command (see above) but also
returns the specified position number incremented by 1.
For example,
PUTI({ 1, 2, 3), 2, 5) returns {{ 1, 5, 3},
3}.
0
(00
LIST ELEMENTS SIZE Returns the number of elements in a list. In RPN mode,
the list must be on level 1.
Lists and Sequences Page 9-7