HP HP-28S User Manual

The functions LOG (common logarithm) and ALOG (common antiloga-
rithm)
compute logarithms and exponentials to base 10. The functions
LN (natural logarithm) and EXP (natural exponential) calculate loga-
rithms and exponentials to base e. (e is a transcendental number
approximately equal to 2.71828182846.)
For an argument x, the function LNP1 (In plus 1) computes In (x + 1),
and the function EXPM (exp minus 1) computes (exp x) - 1. For argu-
ments close to 0, each of these functions provides greater accuracy
than the corresponding sequence of functions. (An example using
LNP1 appears in "Time Value of Money" on page 103.)
Display the second row of the LOGS menu.
~----~-=~~~~~==~=
INEXTI 3: -2.a6761537357E-1g
2: 0::1
1: 2.46855131361379
1iIl:c:Jrm:In1Bill1:iBXl!mm:cJ1lIllC1l1
These are the hyperbolic functions and their inverses: SINH (hyper-
bolic sine) and ASINH (inverse hyperbolic sine), COSH (hyperbolic
cosine) and ACOSH (inverse hyperbolic cosine), and TANH (hyperbolic
tangent) and ATANH (inverse hyperbolic tangent). These functions are
derived from eX, the natural exponential function. All are one-number
functions that act on the number in level 1.
Other Real Functions
The REAL menu contains functions that apply primarily to real
numbers.
Select the REAL menu .
• 1 REAL 1
3: -2.a6761537357E-13
2: a
1: 2.46855131361379
ICIDImIIDmIIIDHlEllUlomm
The function NEG (negate) returns -x for an argument x. The func-
tion FACT (factorial) returns n! for a positive integer n or the gamma
function f(x + 1) for a non-integer argument x. The command
RAND (random number) returns a random number calculated from a
seed specified by RDZ (randomize).
78 5: Real-Number Functions

HP HP-28S Specifications

General

Introduced	1988
Memory	32 KB
Number of Digits	12
Type	Scientific Calculator
Manufacturer	Hewlett-Packard (HP)
Display	LCD
Processor	Saturn
Programming	RPL

Summary

HP-28S Advanced Scientific Calculator Owner's Manual

Part 1: Fundamentals

Introduces basic operations, calculator features, and core concepts.

Getting Started

Covers initial setup, basic operations, and calculator overview.

Doing Arithmetic

Explains methods for performing calculations using stack and expressions.

Part 2: Summary of Calculator Features

Objects

Describes fundamental data types, symbolic operations, and programming elements.

The Command Line

Explains input methods, cursor control, and command entry.

The Stack

Reviews stack concepts and commands for manipulating objects.

Part 3: Programming

Program Structures

Covers conditional logic, loops, and error handling in programs.

Conditional Structures

Explains testing conditions and making decisions within programs.

Definite Loop Structures

Details structures for executing code a specific number of times.

Appendixes & Indexes

Appendix A: Assistance, Batteries, and Service

Provides troubleshooting, battery info, and service details.

Answers to Common Questions

Addresses frequent user queries and common calculator issues.

Appendix B: Notes for HP RPN Calculator Users

Highlights differences for users familiar with RPN calculators.

Appendix D: Menu Map

Lists commands by menu, with descriptions and page references.

Contacting Hewlett-Packard