Correcting Mistakes With Last X - HP 33s Owner's Manual

Correcting Mistakes with LAST X

One–Num
Wrong
If you execute the wrong one–number function, use
number so you can execute the correct function. (Press
clear the incorrect result, from the stack.)
m º p
Since and
these functions in the same manner as from one–number functions.
Example:
Suppose that you had just computed ln 4.7839 × (3.879 × 10
find its square root, but pressed
find the correct result, press
Mistakes with a Two–number Functions
If you make a mistake with a two–number operation, (
¹ b º `
,
you can correct it by using
¹ Í
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
the 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
Í
to recover the second number, and execute the function again. (Press
Å
first if you want to clear the incorrect result from the stack.)
Example:
Suppose you made a mistake while calculating
There are three kinds of mistakes you could have made:
2–8
RPN: The Automatic Memory Stack
File name 33s-E-Manual-1008-Publication(1st).doc
Printed Date : 2003/10/8
ber Function
don't cause the stack to drop, you can recover from
#
by mistake. You don't have to start over! To
¹ Í ?
' ¹ x ¹ {
, , ,
¹ Í
and inverse of the two–number function.
to recover the second number (x just before the operation).
16 × 19 = 304
Page : 386
Size : 13.7 x 21.2 cm
¹ Í
to retrieve the
Å
first if you want to
5
) and wanted to
.
Ù Ã ¸
, ,
m º p
, or
¹ Í
again to restore
¯ )
. , ,
),
¹