Stack display window, Envisioning the stack – HP 48G User Manual
Page 15
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By design, the HP 48 makes it easy to move between one type
of object and another as one solves a problem, explores data, or
communicates results. It accomplishes this
by
using
an
o b je c t
s t a c k
(or
“stack,” for short).
Envision the stack as a special kind of “card box” in which the HP 48
organizes
all of
the objects it uses
in
the course of
calculating, solving,
plotting, and evaluating.
Each object, no matter its size, occupies exactly one “card” in the
"card box.” The object on the first “card” is said to be on “stack level
1,” the object on
the second card
is on
“stack
level 2,”
and so
forth.
The
stack can contain
any number of
objects—from zero to as
many
as available memory permits.
The main display of the HP
48
is the
s t a c k d i s p l a y .
It is
merely a
window showing you a portion of the stack at a time.
i Hflhir f
3:
2
:
1
:
Stack Display
Window
Envisioning the Stack
Objects enter and “leave” the stack at level 1. When you enter a
new object, you place it in the front of the “card box” (stack level
1)
thereby pushing objects
already
in
the
“box”
farther to the back
(increasing their stack levels each by one in the process).
Introducing the HP 48 2-3