HP 39gs Quick Start Guide

52 Getting Started
Getting Started52
Building Your Aplet Library
As shown in the previous Aplet summaries, the HP 39gs comes with a set of 13 built-in Aplets. These Aplets are in Read-Only Memory (ROM) and cannot
be deleted, so pressing the APLET key will always give you access to at least 13 Aplets. However, you can add and delete other Aplets from your Library.
The following sections show you how to manage your Aplet Library.
Saving and Sharing Aplets
This section contains step-by-step instructions for creating, saving, and sharing an Aplet called Fibonacci that is based on the Sequence Aplet.
Description Display
1. Press APLET, highlight the Sequence Aplet, and press the RESET menu key to clear this Aplet of data. Press the
OK menu key to complete the reset and then press the START menu key.
Figure 35
2. The Sequence Aplet starts in the Symbolic view, with ten sequence definitions (Figure 35). The Fibonacci
Sequence definition is:
U1(1)=1
U1(2)=1
U1(N)=U1(N-2)+U1(N-1)
Enter this definition of U1 as shown in Figure 36.
Tip: use the menu keys to enter (N-2), (N-1), etc.
Figure 36

HP 39gs Specifications

General

Type	Scientific
Form factor	Pocket
Product color	Gray
Internal memory	0.256 MB

Weight and Dimensions

Weight	249 g
Dimensions (WxDxH)	187 x 94 x 31 mm