HP 30b HP 20b Business Consultant and HP 30b Business Professional User's Guid - Page 26
One-Number Functions and the Math Menu, roll up, The Mode Menu: Setting, Preferences
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D Pressing performs a swap. A swap operation exchanges the numbers on Levels 1 and 2 D of the stack. The key has a small symbol to the right of the parenthesis symbol to indicate 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. -15 -15 12 -15 41 23 23 41 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. 6:n For example, to calculate 6 , press . The result of 2.45 is calculated 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