HP 15c Collector's Edition User Manual

Section 12: Calculating with Matrices 173
Miscellaneous Operations Involving Matrices
Using a Matrix Element With Register Operations
If a letter key specifying a matrix is pressed after any of the following
function keys, the operation is performed using the matrix element
specified by the row and column numbers in R
0
and R
1
, just as though it
were a data storage register.
O
*
l
*
O{+, -, *, ÷} l{+, -, *, ÷}
e I
X
Using Matrix Descriptors in the Index Register
In certain applications, you may want to perform a programmed sequence
of matrix operations using any of the matrices A through E. In this
situation, the matrix operations can refer to whatever matrix descriptor
is stored in the Index register (R
I
).
If the Index register contains a matrix descriptor:
 Pressing % after any of the functions listed above performs the
operation using the element specified by R
0
and R
1
and the matrix
specified in R
I
.
 Pressing % after O | or l | performs the operation
using the element specified by the row and column numbers in the Y-
and X-registers and the matrix specified in R
I.
 Pressing ´ m V dimensions the matrix specified in R
I
according to the dimensions in the X- and Y-registers.
 Pressing l m V recalls to the X- and Y-registers the
dimensions of the matrix specified in R
I
.
 Pressing G V or t V has the same result as pressing
G or t followed by the letter of the matrix specified in R
I
.
(This is not actually a matrix operation—only the letter in the matrix
descriptor is used.)
*
Also, in U mode the row and column numbers in R
0
and R
1
are incremented
according to the dimensions of the specified matrix.

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.