HP 33s hp 33s_user's manual_English_E_HDPM20PIE56.pdf - Page 46

Using a Number Twice in a Row You can use the replicating feature of ‘ to other advantages. To add a number to itself, press ‘ ›. Filling the stack with a constant The replicating effect of ‘ together with the replicating effect of stack drop (from T into Z) allows you to fill the stack with a numeric constant for calculations. Example: Given bacterial culture with a constant growth rate of 50% per day, how large would a population of 100 be at the end of 3 days? Replicates T register T 1.5 1.5 1.5 1.5 1.5 1. 5 Z 1.5 1.5 1.5 1.5 1.5 Y 1.5 1.5 1.5 1.5 1.5 X 1.5 100 100 150 225 337.5 1 2 3 4 5 1. Fills the stack with the growth rate. 2. Keys in the initial population. 3. Calculates the population after 1 day. 4. Calculates the population after 2 days. 5. Calculates the population after 3 days. How CLEAR x Works Clearing the X-register puts a zero in the X-register. The next number you key in (or recall) writes over this zero. There are three ways to clear the contents of the X-register, that is, to clear x: 1. Press ‡ 2. Press b 3. Press { c {º} (Mainly used during program entry.) Note these exceptions: 2-6 RPN: The Automatic Memory Stack