Correcting mistakes with last x – HP 32SII User Manual
Page 47
The Automatic Memory Stack
2–9
File name 32sii-Manual-E-0424
Printed Date : 2003/4/24 Size : 17.7 x 25.2 cm
See appendix B for a comprehensive list of the functions that save x in the
LAST X register.
Correcting Mistakes with LAST X
Wrong
On
e–Number Function
If you execute the wrong one–number function, use
z
to retrieve
the number so you can execute the correct function. (Press
first if you
want to clear the incorrect result, from the stack.)
Since
{
P
and
{
S
don't cause the stack to drop, you can
recover from these functions in the same manner as from one–number
functions.
Example:
Suppose that you had just computed In 4.7839
Ч
(3.879
Ч
10
5
) and wanted
to find its square root, but pressed
*
by mistake. You don't have to start
over! To find the correct result, press
z
<
.
Mistakes with a Two–number operation
If you make a mistake with a two–number operation, (
,
,
y
,
p
,
0
or
.
), you can correct it by using
z
and inverse of the
two–number function (
or
,
p
or
y
,
.
or
0
).
1. Press
z
to recover the second number (x just before the
operation).
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
z
again to
restore 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
z
to recover the second number, and execute the function again.
(Press
first if you want to clear the incorrect result from the stack.)
Example: