HP 30b HP 30b Business Professional Quick Start Guide - Page 20

Keys Used to Manipulate the RPN Stack, Algebraic Mode, Chain Mode, to return a result - rpn mode

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Keys Used to Manipulate the RPN Stack • Press ( to perform a roll down of the stack. Note the small arrow on the key. A roll down moves the numbers in each register down one level, and the number in the bottom register moves up to the top of the stack. • Press Dto perform a swap of the stack. Note the small symbol on the key. A swap operation exchanges the numbers of the X and Y registers of the stack. • If no menu is selected, the < key performs the roll down operation, and the > key performs the swap operation. Algebraic Mode To perform the same example in Table 1-2 in Algebraic mode, use parentheses to set the order of operation, and key in the expression as it is written from left to right. Press :u

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14
Getting Started
Keys Used to Manipulate the RPN Stack
• Press
(
to perform a roll down of the stack. Note the small arrow on
the key. A roll down moves the numbers in each register down one
level, and the number in the bottom register moves up to the top of the
stack.
• Press
D
to perform a swap of the stack. Note the small symbol on the
key. A swap operation exchanges the numbers of the X and Y registers
of the stack.
• If no menu is selected, the
<
key performs the roll down operation,
and the
>
key performs the swap operation.
Algebraic Mode
To perform the same example in Table 1-2 in Algebraic mode, use parenthe-
ses to set the order of operation, and key in the expression as it is written
from left to right. Press
:u<
(five times) followed by
I
to set
the operating mode to Algebraic. The message on screen,
Algebraic
, con-
firms your choice. Press
O
to return to the default calculator screen, then
press:
(3+4D*(5+6D
Note the expression displays on screen in the order in which it is keyed.
Press
=
to return a result of
77.00
.
Chain Mode
To perform the same example in Chain mode, use parentheses to set the
order of operation as you did in Algebraic mode. Calculations in Chain
mode are interpreted in the order in which they are entered. If you press an
operation key,
+-/*
, after pressing
=
,
the calculation is
continued using the currently displayed value. Use parentheses to set the