Correcting Mistakes With Last X - HP 35s User Manual

Correcting Mistakes with LAST X

Wrong Single Argument Function
If you execute the wrong single argument function, use
the number so you can execute the correct function. (Press
clear the incorrect result from the stack.)

Since and
from these functions in the same manner as from single argument functions.
Example:
Suppose that you had just computed ln 4.7839
its square root, but pressed
the correct result, press
Mistakes with Two Argument Functions
If you make a mistake with a two argument operation (such as
you can correct it by using
operation.

1. Press
2. Execute the inverse operation. This returns the number that was originally first.
The second number is still in the LAST X register. Then:
If you had used the wrong function, press
original stack contents. Now execute the correct function.
If you had used the wrong second number, key in the correct one and
execute the function.
If you had used the wrong first number, key in the correct first number, press

to recover the second number, and execute the function again.

(Press first if you want to clear the incorrect result from the stack.)

don't cause the stack to drop, you can recover

by mistake. You don't have to start over! To find


to recover the second number (x just before the operation).
RPN: The Automatic Memory Stack
(3.879
.
and the inverse of the two argument


to retrieve

first if you want to
5
10 ) and wanted to find
 )
, , or
again to restore the
x
),
2-9