RPN: The Automatic Memory Stack 2-7
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?
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:
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
Y1.5
1.5 1.5 1.5 1.5
X1.5 100
150
225
337.5
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