HP 39g+ Handbuch

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hp 39g+

& hp 39g/40g

Calculations

The purpose of this section of the tutorial is to

introduce the keyboard, highlighting keys that

are used often, and to illustrate the performance

of normal calculations in the HOME view.

•Exploring the keyboard

•The HOME & MODES views

•Order of Operations

•Using COPY & SHOW

The materials presented on this page are adapted from material published by Applications in Mathematics. Materials presented on this page are licensed exclusively to

Hewlett-Packard Co.(“HP ”) by Applications in Mathematics, solely for viewing in this form and on this HP web site. Printing, reproduction or re-transmission in any other form

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hp 39g+ C

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Exploring the keyboard I

Let’s begin by looking at the fundamentals - the layout of the keyboard and the

important keys used frequently. The picture below shows most of the important keys

used to control the operation of the calculator - the others are generally just used to do

calculations once the important keys have set up the environment in which to do it.

The SYMB key nearly always

takes you to a view in which

you can enter equations.

The MATH menu allows access

to a huge range of functions that

would not fit on the keyboard.

The APLET key is central.

This key allows you to

choose which mathematical

environment in which you

wish to work.

These are the cursor (or arrow)

keys. They let you move within a

window.

The DEL key is used to edit

expressions and to restore

default values.

The button is used to

enter either X, Tor

depending on which type of

function is being graphed.

The VIEWS menu is used

as a source of additional

control options.

This is particularly true in

e-lessons.

HOME is where you will do

most of your calculations.

It is an environment that is

shared by all the aplets and

oversees them all.

The PLOT key displays the

graph view for any given

environment.

The NUM key gives you a tabular

view of your function, sequence or

data.

These six screen keys change

their function in different contexts.

The bar at the bottom of the

screen is used to label them.

Hint: Check this bar for special

functions in any given context.

The materials presented on this page are adapted from material published by Applications in Mathematics. Materials presented on this page are licensed exclusively to

Hewlett-Packard Co.(“HP ”) by Applications in Mathematics, solely for viewing in this form and on this HP web site. Printing, reproduction or re-transmission in any other form

hp calculators

hp 39g+ C

& hp 39g/40g

Exploring the keyboard II

In addition to the ALPHA and SHIFT buttons which give access to

the extra functions above and below the buttons, there are a

number of Catalog views which hold special objects such as Lists,

Matrices, Programs and Notes.

The ALPHA button allows you to

type text. Pressing SHIFT ALPHA

gives lower case.

These four buttons give

access to the various

Catalog views.

The SHIFT button

gives access to the

functions above the

keys. The (-) button must be used to

enter negative numbers. Do

not use the subtract button.

The materials presented on this page are adapted from material published by Applications in Mathematics. Materials presented on this page are licensed exclusively to

Hewlett-Packard Co.(“HP ”) by Applications in Mathematics, solely for viewing in this form and on this HP web site. Printing, reproduction or re-transmission in any other form

hp calculators

hp 39g+ C

& hp 39g/40g

The HOME & MODES views I

Press the HOME button to perform normal

calculations. The HOME view can be accessed at

almost any time with no need to go through a menu

system.

All calculations are stored in the History until cleared and can be accessed by

pressing and . You can retrieve and re-use calculations or results by scrolling

through the History to retrieve them (see Using COPY and SHOW).

The settings for angle measures and for numeric display are

controlled by the MODES view. The default settings are shown.

Pressing CHOOSE (screen key 2) will display the choices

available for the highlighted option. The options for Number

Format are shown right.

The materials presented on this page are adapted from material published by Applications in Mathematics. Materials presented on this page are licensed exclusively to

Hewlett-Packard Co.(“HP ”) by Applications in Mathematics, solely for viewing in this form and on this HP web site. Printing, reproduction or re-transmission in any other form

hp calculators

hp 39g+ C

& hp 39g/40g

The HOME & MODES views II

The name of the currently active aplet is displayed at the top of

the HOME view as a reminder of which one is active

(see The APLET view for more information on aplets).

The reason for this is that the MODES settings are linked to the aplet. Therefore,

changing aplets may result in your MODES settings changing with it.

Although this may seem strange there is a good reason for it. Suppose we are working

in the Solve aplet and change the angle settings from Radians to Degrees. If we later

change from the Solve aplet to the Parametric aplet then the settings for the

Parametric aplet will be unaffected by any changes we made while in the Solve aplet.

Also, changing back to the Solve aplet later will restore the Degrees choice regardless

of what was done elsewhere.

Conversely, HOME always mirrors the settings of the current aplet so that any

calculations done in the HOME view match those done in the aplet. For example, if

you were to find a root for a trig function F1(X) in the PLOT view then typing F1(Root)

in the HOME view would not give zero if the angle modes did not match.

The materials presented on this page are adapted from material published by Applications in Mathematics. Materials presented on this page are licensed exclusively to

Hewlett-Packard Co.(“HP ”) by Applications in Mathematics, solely for viewing in this form and on this HP web site. Printing, reproduction or re-transmission in any other form

hp calculators

hp 39g+ C

& hp 39g/40g

The HOME & MODES views III

The HOME view can access and use any objects or functions

defined in any other environment on the calculator.

For example, suppose we define a function f(x)=x2– 4 in the

SYMB view of the Function aplet. As the examples below

demonstrate, we can now access this in the HOME view and in other aplets.

As well as the functions which appear on the buttons on the keyboard, there are

additional functions available through the MATH menu. Two examples are shown

below. The MATH functions can also be used to define functions and in programs.

See The MATH menu for more detail.

To perform the two calculations

shown, press the buttons below:

Pressing 9(or R) will jump

immediately to the first menu entry

that begins with the letter ‘R’.

There is no need to press ALPHA.

MATH 9 9 ENTER 0.005248 , (-) 3 ) ENTER

MATH 7 ENTER 2 ALPHA X - 1 ) XY3

,ALPHAX)ENTER

The materials presented on this page are adapted from material published by Applications in Mathematics. Materials presented on this page are licensed exclusively to

Hewlett-Packard Co.(“HP ”) by Applications in Mathematics, solely for viewing in this form and on this HP web site. Printing, reproduction or re-transmission in any other form

hp calculators

hp 39g+ C

& hp 39g/40g

Order of Operations

The normal conventions for order of operations are followed by the calculator. Some

examples are shown below, both as they appear in the HOME view and after pressing

SHOW (see Using COPY and SHOW).

→

Notes:

1. The hp 39g, hp 40g and hp 39g+ use Direct Algebraic entry order rather than

RPN (Reverse Polish Notation) when entering calculations. It is not possible to

use RPN.

2. When using brackets in your expressions to over-ride the normal order of

operations, you should only use the normal brackets (and ). The other

brackets { } and [ ] you will see on the keyboard are used for particular

purposes.

For example, the { } brackets are used for lists and sets

while the [ ] brackets are used for matrices and vectors.

3. When raising a negative to a power you must use

brackets. For example, (-3)2will give 9 but –32gives –9.

The materials presented on this page are adapted from material published by Applications in Mathematics. Materials presented on this page are licensed exclusively to

Hewlett-Packard Co.(“HP ”) by Applications in Mathematics, solely for viewing in this form and on this HP web site. Printing, reproduction or re-transmission in any other form

hp calculators

hp 39g+ C

& hp 39g/40g

Using COPY & SHOW I

Until you erase it by pressing SHIFT CLEAR, every calculation performed in the HOME

view is stored in the History. You can scroll back through this list of calculations and

copy them for editing or re-use. The COPY button only becomes visible once you are

in the History (see above). The following example illustrates the skills involved.

Button sequence Results

7g / 160 * 100 ENTER

COPY SHIFT 5 ENTER

( COPY + 30 ) / 2 ENTER

SHIFT COPY SHIFT DEL 8 ENTER

SHIFT CLEAR

The materials presented on this page are adapted from material published by Applications in Mathematics. Materials presented on this page are licensed exclusively to

Hewlett-Packard Co.(“HP ”) by Applications in Mathematics, solely for viewing in this form and on this HP web site. Printing, reproduction or re-transmission in any other form

hp calculators

hp 39g+ C

& hp 39g/40g

Using COPY & SHOW II

Because calculations are entered on a single line it is sometimes hard to be sure that

the expression you have entered is correct. For this reason the calculator provides the

SHOW button.

Once an expression has been evaluated you can highlight it using the arrow keys and

then press SHOW. Some examples, with keystrokes are shown below. After

performing each calculation, simply press SHOW to view the result shown in

the third column. Press OK (screen key 6) to return to the HOME view.

( 7 + 8 + 3 + 1 ) / 5 ENTER

SHIFT MATRIX EDIT 5 ENTER 3

ENTER 3 ENTER 2 ENTER

HOME ALPHA M 1 SHIFT x-1

ENTER

Note: Highlight the result rather than the

calculation before pressing SHOW.

SHIFT ALPHA I SHIFT = 1 , 5

, ALPHA I x2+ 1 ) ENTER

SHIFT ( 0 , 30 , ALPHA X x2

/ 5 , ALPHA X ) ENTER

The materials presented on this page are adapted from material published by Applications in Mathematics. Materials presented on this page are licensed exclusively to

Hewlett-Packard Co.(“HP ”) by Applications in Mathematics, solely for viewing in this form and on this HP web site. Printing, reproduction or re-transmission in any other form