[49] RPN and editing

[Max]

Hi,
I bought a HP 49g few days ago.
I read UG and AUG, but I found 'em poor, and I hope someone can help me:
I think these questions are trivial for you, gurus :)

1) In ALGEBRAIC mode I'm able to open PLOT SETUP input form pressing:

<- , F4 (alias 2D/3D)

in RPN this doesn't work! The only way to open PLOT SETUP, PLOT
FUNCTION... seems by pressing:

APPS , Plot function.. , Equation entry/Plot setup/...

** Can I use the funcion keys?

2) In ALGEBRAIC mode if I EDIT some object in history my HP opens the
appropriate application (MTRW, EQW...).
In RPN it opens something like a text editor.
** Is it possible to edit objects on the stack?

I would really try RPN, but I it's not well documented.

Finally in ALGEBRAIC mode I tried the following:

SUBST(20*LOG*ABS(s/(s^2/w^2+2*z*s/w+1)), s=i*X) [STO] W

It took a lot of time! HP reshaped the funcion evaluating the modulo of
the function (MONSTROUS), but I was only tryng to store in W a function
in which I substituted s with i*X.
(band-pass filter transfer function -> armonic response).

** How can I use SUBST without elaborating the function?

Thax for your time,
I hope you can help me!

Max

[Linux11r6]

1) you hold <- then press F4 then release both

Max <max.c...@subdimension.com> wrote in message
news:986es9$oo9$1...@pegasus.tiscalinet.it...

[Jean-Yves Avenard]

Hello

"Max" <max.c...@subdimension.com> wrote in message
news:986es9$oo9$1...@pegasus.tiscalinet.it...

> Hi,
> I bought a HP 49g few days ago.
> I read UG and AUG, but I found 'em poor, and I hope someone can help me:
> I think these questions are trivial for you, gurus :)
>
> 1) In ALGEBRAIC mode I'm able to open PLOT SETUP input form pressing:
>
> <- , F4 (alias 2D/3D)
>
> in RPN this doesn't work! The only way to open PLOT SETUP, PLOT
> FUNCTION... seems by pressing:

You have to press Shift and Hold it while pressing F4. So RPL keep backward
compatibility with previous HP48 model.

>
> APPS , Plot function.. , Equation entry/Plot setup/...
>
> ** Can I use the funcion keys?

Sure you can.

>
> 2) In ALGEBRAIC mode if I EDIT some object in history my HP opens the
> appropriate application (MTRW, EQW...).
> In RPN it opens something like a text editor.
> ** Is it possible to edit objects on the stack?

You can. But it's not as integrated as in algebraic mode (it works the same
way as the HP48). If you look in the EDIT menu, you will see that you can
halt the edition and start a new environment, from then, simply start a new
editor, create your object. Copy it into the clipboard go back into the
previous editing environment (pressing CONT) and paste your object.
Or you can start typing your object, select it using BEGIN and END and in
the EDIT menu, select EDITB

>
> I would really try RPN, but I it's not well documented.
>
> Finally in ALGEBRAIC mode I tried the following:
>
> SUBST(20*LOG*ABS(s/(s^2/w^2+2*z*s/w+1)), s=i*X) [STO] W
>
> It took a lot of time! HP reshaped the funcion evaluating the modulo of
> the function (MONSTROUS), but I was only tryng to store in W a function
> in which I substituted s with i*X.
> (band-pass filter transfer function -> armonic response).
>
> ** How can I use SUBST without elaborating the function?

By default, in algebraic mode when you press ENTER all your expressions will
be simplified from left to right.
So here, SUBST will run first then your expression will be store in W.
If you don't want the calculator to simplify your expression, surround it
with quotes like:
'SUBST(20*LOG*ABS(s/(s^2/w^2+2*z*s/w+1)), s=i*X)' [STO] W

Or you can also do:
QUOTE(SUBST(20*LOG*ABS(s/(s^2/w^2+2*z*s/w+1)), s=i*X)) [STO] W

Hope this helps
Jean-Yves

[John H Meyers]

Max:

> in RPN mode, left-shifted top-row keys [A-F] don't do BLUE functions

The full reason is that left-shift is actually used like a
STO key with variables (in the VAR menu), just as right-shift
is used like RCL with variables; both shift keys also otherwise
still invoke other functions in many other original HP48 menus.

You can "shift-and-hold" before pressing those keys,
but you should be careful when so doing, since if you
fail to HOLD the shift key down securely, you might end up
unintentionally *storing* into a variable.

If it were possible for the *other* [red] shift key to invoke
those special functions, then it would be safer (any slip-up
would only recall something, rather than clobber something);
this is a fine point in the field of Human Factors design.

Note also that RCL command on HP49 keyboard uses the same shift key
as for directly STOring into VARiables (HP48 more consistently used
the same shift key as for RCLing from VARiables).

Not too serious in a calculator, but please give it more attention
when you design systems where physical safety is at stake, e.g.
do not place "pilot eject" button next to "lower landing gear" :)

-----------------------------------------------------------
With best wishes from: John H Meyers <jhme...@mum.edu>

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[Max]

Thanx!!!

I've resolved my problems! (by now...)