HP 39gs Master Manual page 338

The PUSH and POP commands
Occasionally it is desirable to transfer results from the normal
view to the CAS screen or vice versa.
This is done using the
PUSH
Suppose we have just expanded (2x+3)
we press to exit the CAS and then type
HOME
then the result will be retrieved to the
of the command erases the last line of the CAS History so using it a
POP
second time will generally produce different results.
In this case we might wish to also paste the result into the Function aplet.
Unfortunately the command only works in the
POP
in the Function aplet. However you can use
expression, enclosing it in single quotes from the
storing it ( ) into
F1(X)
The reverse process is also possible using
that you must use the symbolic variable
you will find that seemingly there has been no result. However,
when you access the CAS History by pressing
the expression has been added to the tail of the History and can now be
transferred to the editing screen using
The drawback is that it comes through still using
this may cause problems later. In general the
really very useful.
Pasting to an aplet
As mentioned above, one method of transferring CAS results to a normal
aplet such as Function is to use the
graphing results, there is an even easier method - simply press
Suppose that we have a result in the CAS editor as shown right.
Pressing the button will result in the menu shown in the second
PLOT
screen.
and commands.
POP
4 in the CAS, as shown right. If
POP
screen as shown. The use
HOME
or whichever is desired as shown right.
PUSH
. When you then press
S1
SYMB
.
PUSH
command. However, for
POP
HOME
in the view
HOME
view and not
HOME
to retrieve the
view and then
CHARS
but it is more limited in
you will find that
as the variable and
S1
command is not
.
PLOT
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