HP 48GII User Manual

Full Command and Function Reference 3-37
COV
Type: Command
Description: Covariance Command: Returns the sample covariance of the independent and dependent data
columns in the current statistics matrix (reserved variable ΣDAT).
The columns are specified by the first two elements in reserved variable ΣPAR, set by XCOL
and YCOL respectively. If ΣPAR does not exist, COV creates it and sets the elements to their
default values (1 and 2).
The covariance is calculated with the following formula:
1
n 1–
------------
x
in
1
x
n
1
–()x
in
2
x
n
2
–()
i 1=
n
∑
where is the ith coordinate value in column n
1
, is the ith coordinate value in the column
n
2
, is the mean of the data in column n
1
, is the mean of the data in column n
2
, and n is
the number of data points.
Access: …µ
COV
Input/Output:
Level 1/Argument 1 Level 1/Item 1
→
x
covariance
See also: COLΣ, CORR, PCOV, PREDX, PREDY, XCOL, YCOL
CR
Type: Command
Description: Carriage Right Command: Prints the contents, if any, of the printer buffer.
CR sends to the printer a string that encodes the line termination method. The default
termination method is carriage-return/linefeed. The string is the fourth parameter in the reserved
variable PRTPAR.
Access: …µ
CR
Flags: I/O Device (–33), Printing Device (–34), Double-Spaced Printing (–37)
Input/Output: None
See also: DELAY, OLDPRT, PRLCD, PRST, PRSTC, PRVAR, PR1
CRDIR
Type: Command
Description: Create Directory Command: Creates an empty subdirectory with the specified name in the
current directory.
CRDIR does not change the current directory; evaluate the name of the new subdirectory to
make it the current directory.
Access: !°
MEMORY DIRECTORY CRDIR ( °is the left-shift of the Nkey).
Input/Output:
Level 1/Argument 1 Level 1/Item 1
'global'
→
See also: HOME, PATH, PGDIR, UPDIR
CROSS
Type: Command
Description: Cross Product Command: CROSS returns the cross product C = A
× B of vectors A and B.
The arguments must be vectors having two or three elements, and need not have the same
number of elements. (The hp49g+/hp48gII automatically converts a two-element argument
x
in
1
x
in
2
x
n
1
x
n
2

HP 48GII Specifications

General

Battery type	CR2032
Type	Scientific
Form factor	Pocket

Weight and Dimensions

Weight	220 g
Dimensions (WxDxH)	184 x 87 x 23.5 mm

Summary

RPL Programming

Understanding Programs

Programs as objects, delimiters, and basic structure.

Entering and Executing Programs

Details on how to create, store, and run programs.

Using Conditional Structures

Covers IF, CASE, IFT, IFTE structures for program decision-making.

Input and Output Commands

Details commands like PROMPT, INPUT, INFORM, CHOOSE for user interaction.

RPL Programming Examples

Fibonacci Numbers

Demonstrates recursive and loop-based Fibonacci calculations.

Minimum and Maximum Array Elements

Details finding min/max elements using MNX and MNX2.

Applying a Program to an Array

Explains the APLY command for transforming array elements.

Full Command and Function Reference

How to Access Commands and Functions

Explains key presses and menu paths to access commands.

ABS (Absolute Value)

Details the absolute value function and its array behavior.

ACOS (Arc Cosine)

Explains the inverse cosine function, domain, and range.

Computer Algebra Commands

CAS Operations

Overview of CAS operations and their categorization by menu.

Algebra commands

Lists and describes commands for algebraic manipulation.

Calculus Commands

Covers derivation, integration, and limit commands.

Equation Reference

Columns and Beams (1)

Provides equations for structural mechanics.

Electricity (2)

Lists equations related to electrical circuits and laws.

Fluids (3)

Covers equations for fluid mechanics.

The Development Library

Introduction

Explains the purpose and usage of the development library.

Tools for Development

Details APEEK, PEEK, POKE, POKEARM commands.

MASD Compiler

Discusses syntax, modes, and directives for MASD.

Error and Status Messages

Messages Listed Alphabetically

Alphabetical list of error messages.

Messages Listed Numerically

Numerical list of error messages by hex code.

System Flags

System Flags (continued)

Description of various system flags.

System Flags (continued)

Continuation of system flags description.

Reserved Variables

Contents of the Reserved Variables

Explanation of key reserved variables.

PPAR

Details plotting parameters.

Technical Reference

Object Sizes

Lists object sizes in bytes.

Symbolic Integration Patterns

Provides a table of symbolic integration patterns.

Parallel Processing With Lists

General rules for parallel processing

Explains conditions for parallel list processing.

Group 4: ADD and +

Describes how ADD and + handle parallel list operations.

Keyboard Shortcuts

Press and Hold key combinations

Lists functions performed by key combinations.

Shifted softkeys

Explains shift key effects on menu labels.

The Menu-Number Table

-- menus 0-117 are semi-compatible with 48G menus --

Menu numbers and paths for built-in menus.

-- New Library 222 commands --

Details commands available in Library 222.