One-Number Functions And The Math Menu - HP 30b - Business Professional Calculator User Manual

D
Pressing performs a swap. A swap operation exchanges the numbers on Levels 1 and 2
of the stack. The
the swap feature. With the numbers entered into the stack shown in the left column in Figure 7,
D
pressing performs a swap to the stack as shown in the right column.
NOTE: when no menu is selected, the
>
The key performs the inverse operation called, roll up.

One-Number Functions and the Math Menu

The key presses for the one-number mathematical functions listed in Table 2-4 below apply to
all modes, Chain, Algebraic, and RPN. To execute one-number functions, with a number
displayed, press the key or key combination corresponding to the operation you wish to
execute. The result is displayed on the bottom line.
For example, to calculate
immediately and displayed on the bottom line. Note the square root symbol appears on the
top line.
NOTE: before doing any trigonometric calculations in the Math menu, check whether the
angle mode is set for degrees (Degree) or radians (Radian). You will need to change the
setting if the active mode is not what your problem requires. For more information on the
Mode menu and calculator settings, refer to the section titled, The Mode Menu: Setting
Preferences in Chapter 1. Table 2-4 lists one-number functions along with their corresponding
keys.
18 Mathematical Calculations
D
key has a small symbol to the right of the parenthesis symbol to indicate
-15
12
41
23
Figure 7 The RPN Stack and the Swap Operation
6:n
6 , press
-15
-15
23
41
<
key performs the same function as the
. The result of 2.45 is calculated
(
key.