HP 35s HP 35s scientific calculator - User Guide - Page 53

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 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  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 to Clear the Stack 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 four ways to clear the contents of the X-register, that is, to clear x: 1. Press  2. Press  3. Press  Mainly used during program entry.) 4. Press  to clear the X-, Y-, Z-, and T-registers to zero. For example, if you intended to enter 1 and 3 but mistakenly entered 1 and 2, this is what you should do to correct your error: RPN: The Automatic Memory Stack 2-7