HP 15c Collector's Edition User Manual

Section 4: Statistics Functions 49
Keystrokes Display
.5764
0.5764
Stores 0.5764 as random number
seed. (The ´ keystroke may be
omitted.)
O ´ #
0.5764
´ #
0.3422
Random number sequence
initiated by the above seed.
´ #
0.2809
−
0.0000
l ´ #
0.2809
Recalls last random number
generated, which is the new seed.
(The ´ may be omitted.)
Accumulating Statistics
The HP 15c performs one- and two-variable statistical calculations. The
data is first entered into the Y- and X-registers. Then the z function
automatically calculates and stores statistics of the data in storage
registers R
2
through R
7
. These registers are therefore referred to as the
statistics registers.
Before beginning to accumulate statistics for a new set of data, press
´ CLEAR ∑ to clear the statistics registers and stack. LAST X is not
cleared. (If you have reallocated registers in memory and any of the
statistics registers no longer exist, Error 3 will be displayed when you try
to use CLEAR ∑, z, or w. Appendix C explains how to reallocate
memory.)
In one-variable statistical calculations, enter each data point (x-value) by
keying in x and then press z.
In two-variable statistical calculations, enter each data pair (the x- and y-
values) as follows:
1. Key y into the display first.
2. Press v. The displayed y-value is copied into the Y-register.
3. Key x into the display.
4. Press z. The current number of accumulated data points, n, will
be displayed. The x-value is saved in the LAST X register and y
remains in the Y-register. z disables stack lift, so the stack will
not lift when the next number is keyed in.

HP 15c Collector's Edition Specifications

General

Model	HP 15c Collector's Edition
Category	Calculator
Type	Scientific
Power Source	Battery
Manufacturer	HP
Display	LCD
Functions	complex numbers, matrix operations

Summary

Introduction

This Handbook

Outlines the structure of the manual, detailing its parts and how to use it for learning.

The HP Community

Discusses user groups and websites for HP calculator enthusiasts and information sharing.

Part I: HP 15c Fundamentals

Section 1: Getting Started

Covers basic operations like powering on, keyboard layout, and primary/alternate functions.

Section 2: Numeric Functions

Explains essential numeric operations including logs, trig, powers, and conversions.

Section 3: The Automatic Memory Stack, LAST X, and Data Storage

Details the RPN stack, LAST X register, and data storage operations.

Part II: HP 15c Programming

Section 6: Programming Basics

Introduces core programming concepts: creating, loading, running programs, and memory.

Section 8: Program Branching and Controls

Covers controlling program flow using branching, loops, and conditional tests.

Part III: HP 15c Advanced Functions

Section 11: Calculating With Complex Numbers

Covers entering, manipulating, and performing calculations with complex numbers.

Section 12: Calculating With Matrices

Explains matrix operations, including dimensioning, element access, and calculations.

Section 13: Finding the Roots of an Equation

Details using the SOLVE function for numerical root finding and equation solving.

Section 14: Numerical Integration

Explains how to perform numerical integration using the ∫f(x)dx key and subroutines.

Appendix A: Error Conditions

Error 8: No Root

Explains the error when the SOLVE function cannot find a root.

Error 0: Improper Mathematics Operation

Lists and explains errors related to mathematical operations and illegal arguments.

Appendix D: A Detailed Look at SOLVE

How SOLVE Works

Explains the numerical technique and logic behind the SOLVE algorithm.

Finding Several Roots

Discusses methods for finding multiple roots of an equation using the SOLVE function.