HP 39g+ Manual

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hp 39g+
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Calculations
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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
or venue is prohibited. ©2003 Applications in Mathematics. All rights reserved.

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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
or venue is prohibited. ©2003 Applications in Mathematics. All rights reserved.

hp calculators
hp 39g+ C
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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
or venue is prohibited. ©2003 Applications in Mathematics. All rights reserved.

hp calculators
hp 39g+ C
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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
or venue is prohibited. ©2003 Applications in Mathematics. All rights reserved.

hp calculators
hp 39g+ C
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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
or venue is prohibited. ©2003 Applications in Mathematics. All rights reserved.

hp calculators
hp 39g+ C
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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
or venue is prohibited. ©2003 Applications in Mathematics. All rights reserved.

hp calculators
hp 39g+ C
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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
or venue is prohibited. ©2003 Applications in Mathematics. All rights reserved.

hp calculators
hp 39g+ C
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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
or venue is prohibited. ©2003 Applications in Mathematics. All rights reserved.

hp calculators
hp 39g+ C
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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
or venue is prohibited. ©2003 Applications in Mathematics. All rights reserved.