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Mathematical Calculations

Figure 6 The RPN Stack and the Roll Down Operation

Pressing ) performs a

swap

. A swap operation exchanges the numbers on Levels 1 and 2 of the stack. The ) key has

a small symbol on it as a reminder of the swap feature. With the numbers entered into the stack shown in the left column in

Figure 7, pressing ) performs a swap to the stack as shown in the right column.

Figure 7 The RPN Stack and the Swap Operation

Note: when no menu is selected, the < key performs the same function as the ( key. 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.

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 74 75

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Hp 20B User Manual Page 22