21
E
E
V
V
E
E
R
R
Y
Y
T
T
H
H
I
I
N
N
G
G
R
R
E
E
V
V
O
O
L
L
V
V
E
E
S
S
A
A
R
R
O
O
U
U
N
N
D
D
A
A
P
P
L
L
E
E
T
T
S
S
!
!
A set of “aplets” is provided in the APLET view on the hp 39g+. This
effectively mean that it is not just one calculator but nine (or more), changing
capabilities according to which aplet is chosen.
The best way to think of these aplets is as “environments” or “rooms” within
which you can work. Although these environments may seem dissimilar at
first, they all have things in common, such as that the PLOT key produces
graphs, that the SYMB key puts you into a screen used to enter equations and
rules, and that the NUM key displays the information in tabular form.
There are ten standard aplets available via the APLET key. More can be
created by you or obtained via the Internet (see pages 212 & 200)
The Function aplet (see page 51)
Provides f(x) style graphs, calculus functions etc. It will not only
graph but find intercepts, intersections, areas and turning
points.
The Inference aplet (see page 150)
Allows the investigation of inferential statistics via hypothesis
testing and confidence intervals. This was not available on the
hp 38g, the original calculator upon which the hp 39g+ was
based.
The Parametric aplet (see page 100)
Handles x(t), y(t) style graphs. Can also be used to help with
vector motion.
The Finance aplet (see page 160)
Performs calculations involving time/value of money.
The Polar aplet (see page 106)
Handles r(θ) style graphs. Quite apart from their mathematical
use, they produce some really lovely patterns!
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