# Chapter 8 - Operations With Lists; Definitions; Creating And Storing Lists - HP 48gII User Manual

Graphing calculator.

Chapter 8
Operations with lists
Lists are a type of calculator's object that can be useful for data processing
and in programming. This Chapter presents examples of operations with lists.

### Definitions

A list, within the context of the calculator, is a series of objects enclosed
between braces and separated by spaces (#), in the RPN mode, or
commas (‚í), in both modes. Objects that can be included in a list are
numbers, letters, character strings, variable names, and/or operators. Lists
are useful for manipulating data sets and in some programming applications.
Some examples of lists are:
{ t 1 }, {"BETA" h2 4}, {1 1.5 2.0},
{a a a a}, { {1 2 3} {3 2 1} {1 2 3}}
In the examples shown below we will limit ourselves to numerical lists.

### Creating and storing lists

To create a list in ALG mode, first enter the braces key „ä (associated
with the + key), then type or enter the elements of the list, separating them
with commas (‚í). The following keystrokes will enter the list {1 2 3 4}
and store it into variable L1.
„ä 1 ‚í 2 ‚í 3 ‚í 4
™K~l1`
The screen will show the following:
The figure to the left shows the screen before pressing `, while the one to
the right shows the screen after storing the list into L1. Notice that before
pressing ` the list shows the commas separating its elements. However,
after pressing `, the commas are replaced with spaces.
Entering the same list in RPN mode requires the following keystrokes:
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