HP 30b Professional manual Keys Used to Manipulate the RPN Stack, Algebraic Mode

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 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 Ito set the operating mode to Algebraic. The message on screen, Algebraic , con- firms your choice. Press Oto return to the default calculator screen, then

press: J(3+4D*(5+6DK

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

14 Getting Started