Tech Support > Computer Hardware > Laptops/Notebooks > RPN Calculator
RPN Calculator
Posted by -oo0-GoldTrader-0oo- on April 27th, 2005


Tiger now has RPN Calculator
Use the reverse polish method of calculator input.

Its about time.

Yeechang Lee wrote:

Posted by George Berger on April 27th, 2005


In article <1114589696.445851.51650@z14g2000cwz.googlegroups. com>,
"-oo0-GoldTrader-0oo-" <nomads_05@yahoo.com> wrote:

There's also a HP 12C application available. Go Google
It's a direct transfer from a real one to the computer application.

--
I know that you believe that you understood what you think I said, but I am
not sure you realize that what you heard is not what I meant.
-- Robert McCloskey, State Department spokesman (attributed)

Posted by Jay Maynard on April 27th, 2005


On 2005-04-27, George Berger <gberger@his.com> wrote:
Any idea how they did it? I'd love to see a 16C version...but I'm not
willing to destroy my 16C to do it.

Posted by Steve Lidie on April 27th, 2005


In comp.sys.mac.system Jay Maynard <jmaynard@thebrain.conmicro.cx> wrote:

I can't belive I'm reading this, having writtem Perl/Tk versions of an
HP 21 and HP 16C myself!

http://www.lehigh.edu/~sol0/ptk/imag...calc-large.png

Posted by Jay Maynard on April 27th, 2005


On 2005-04-27, Steve Lidie <lusol@Dragonfly.cc.lehigh.edu> wrote:
After finding the app, it's an emulation, not a direct transfer of the
built-in software, which is what I'd thought the oriignal poster said.

The 21 isn't that hard to do; the 16C is, if you emulate everything. Some of
the functions are quite tricky to get right in all modes of the machine.

Posted by Gnarlodious on April 27th, 2005


Entity -oo0-GoldTrader-0oo- spoke thus:

FAR OUT! Good move, Apple!
Wonder if the App is scriptable?


-- Gnarlie
echo 38698196677083401706731788025369086101258315035012 362P|dc


Posted by Randy Howard on April 27th, 2005


In article <slrnd6vb9p.ngu.jmaynard@thebrain.conmicro.cx>,
jmaynard@thebrain.conmicro.cx says...
Yes, but there are entire websites devoted to old HP calculator
emulators, of various degrees of quality. I too long for the 16C I
once had, and lost somewhere. I still have a 41CV, but recently
purchased their 33s, which is RPN, but is a disappointment. The
kbd layout is too funky.

That being said, I despise computer calculators, especially the
scientific variety, it is too time consuming clicking mouse buttons
instead of just typing on a good handheld calculator that you know
well. Having a computer application to do it completely misses the
point of having a convenient, handheld, instant-on device that you
are familiar with and efficient in the use therof. Note that a
HP calculator doesn't have pop-up help, but it is very user friendly,
provided the user knows something about mathematics.

The touchscreen versions of calculators for things like Ipaqs come
closer, but still not quite as efficient to use.


--
Randy Howard (2reply remove FOOBAR)
"Making it hard to do stupid things often makes it hard
to do smart ones too." -- Andrew Koenig

Posted by Randy Howard on April 27th, 2005


In article <BE950F4C.8F0E%gnarlodious@yahoo.com>,
gnarlodious@yahoo.com says...
Dunno, but any command line scriptable one you can
find open source can probably be ported over easily
to the Mac.

I don't know of one offhand, but you might start
here:
http://www.hpcalc.org/

--
Randy Howard (2reply remove FOOBAR)
"Making it hard to do stupid things often makes it hard
to do smart ones too." -- Andrew Koenig

Posted by Timberwoof on April 28th, 2005


In article <slrnd6v864.n6h.jmaynard@thebrain.conmicro.cx>,
Jay Maynard <jmaynard@thebrain.conmicro.cx> wrote:

There's an O'Reilly book on learning programming with OS X. One of the exercises
is a calculator. I didn't like it, so I rewrote it to be an RPN calculator. (I
needed to change some keys, add a stack, and rewrite the operators. No biggie.)
So to emulate a 16c would be easy enough. Add the keys, bind a routine to each
one that does the right things, and off you go.

--
Timberwoof <me at timberwoof dot com> http://www.timberwoof.com
If Macintosh is a luxury cruise ship,
then Linux is a freighter with wood paneling in the officers' quarters.

Posted by Timberwoof on April 28th, 2005


In article <MPG.1cd98eec68da7e1f98a4cc@news.verizon.net>,
Randy Howard <randyhoward@FOOverizonBAR.net> wrote:

There's no reason why the numeric keypad on a big keyboard can't do what an RPN
calculator does. The tricky part is all the special functions. I suppose one
could cheat on those and set them up with text abbreviations (and the equals key
to close them): Instead of clicking the Sin button, you'd type

5 <enter> sin= 4 +

to get sin(5)+4 .

A clever programmer can make the keys of the computer substitute for the buttons
on the screen. Then the copy and paste functions become useful.

--
Timberwoof <me at timberwoof dot com> http://www.timberwoof.com
If Macintosh is a luxury cruise ship,
then Linux is a freighter with wood paneling in the officers' quarters.

Posted by Timberwoof on April 28th, 2005


In article <MPG.1cd990964561a39198a4cd@news.verizon.net>,
Randy Howard <randyhoward@FOOverizonBAR.net> wrote:

Why script a calculator if the scripting language already does math?

--
Timberwoof <me at timberwoof dot com> http://www.timberwoof.com
If Macintosh is a luxury cruise ship,
then Linux is a freighter with wood paneling in the officers' quarters.

Posted by Randy Howard on April 28th, 2005


In article <timberwoof-C02202.17184427042005@typhoon.sonic.net>,
timberwoof@stimpberawoofm.com says...
Perhaps because you want to use something special available on
the calculator. Think the add-on packs for the HP41CV/CX.

--
Randy Howard (2reply remove FOOBAR)
"Making it hard to do stupid things often makes it hard
to do smart ones too." -- Andrew Koenig

Posted by Gnarlodious on April 28th, 2005


Entity Timberwoof spoke thus:

example:

tell application "RPN Calculator" to open dateCalculator
tell dateCalculator to run routine julianCentury with parameters { 2005, 4,
20, 32, 4, 55 }
Set the result to centuryIncrement

.... and use that variable in your Applescript

While you can't run routines on an algebraic calculator, you can on an RPN
calculator.


-- Gnarlie
http://PowerMops.com/
PowerMops: Forth Programming Language for Macintosh




Posted by Phil Earnhardt on April 28th, 2005


On Wed, 27 Apr 2005 17:59:14 GMT, Randy Howard
<randyhoward@FOOverizonBAR.net> wrote:

There are 4 HP 16Cs being auctioned on ebay right now. The "Buy it
Now" price is set somewhere near $200.

(Non-sequitur question: is there any way to get data of pricing info
for old Ebay auctions?)

If you think these are pricey, check out Ebay for the Curta mechanical
calculators. These guys seem to go for well north of $500 each. A
website describing these guys and their inventor was published in the
1/2004 issue of Scientific American. The website
http://www.vcalc.net/cu.htm contains many pictures plus a working
simulator of the Curta. Way cool! And I highly recommend the SciAm
article.

I still have my battle-scarred HP 16C (which has survived several
endian attacks through the years). Years ago when I was in a
Computation Structures course, I was going in for a test which
contained questions on 1's and 2's complement arithmetic. I asked my
TA if I needed to check my calculator at the door. He declined,
saying: "We find that people who own this calculator have no problem
with these concepts." Funny! I did the questions by hand and verified
them with my calculator.

HP still sells the 12c financial calculator. I've sometimes wondered
why they never did periodic manufacturing runs of the 16c machines.

--phil


Posted by Randy Howard on April 28th, 2005


In article <j5p071l9slsti00p8t2en62gmponq8q53n@4ax.com>, pae@dim.com
says...
I'd be leary of getting one with a bad key or something from e-bay.
If I could test it out in person first, it might be worth it. I
find I can do most of the stuff in my head nowadays that I used
to use it for anyway.

No idea, I don't do the ebay thing.

Yeah, I've seen them before (over the web) but never up close. They
would probably be worth that, and appreciate further over time. But,
I don't have an abacus collection either, so apart from being a
mechanical marvel, not that useful to me.

:-) Excellent, and probably quite accurate. You could always tell
who was going to have trouble in engineering courses back then,
because they were carrying a Casio or a Ti instead of an HP.

A mystery never fully explained. :-) Beancounters today use excel
like it came out of the womb with them.

Probably because they can no longer replicate the keyboard feel.
People still whine about the lack of the 41CV feel even today.
When the big HP RPN calculators came out recently, they got slagged
horribly for keyboard problems. Quality is job 4,379 nowadays.
Especially if the parts suppliers are all in Taiwan.

--
Randy Howard (2reply remove FOOBAR)
"Making it hard to do stupid things often makes it hard
to do smart ones too." -- Andrew Koenig

Posted by Charlie Hoffpauir on April 28th, 2005


On Thu, 28 Apr 2005 05:42:31 GMT, Randy Howard
<randyhoward@FOOverizonBAR.net> wrote:

This thread brought back some great memories.... Being an engineer, I
never found a reason to buy a 12C, but I still have my 16C and a pair
of 15C's (one for at work and one at home). I imagine they will
"always" be the finest calculators ever made.
Charlie Hoffpauir
http://freepages.genealogy.rootsweb.com/~charlieh/

Posted by TravelinMan on April 28th, 2005


In article <j5p071l9slsti00p8t2en62gmponq8q53n@4ax.com>,
Phil Earnhardt <pae@dim.com> wrote:

Yes. Do an advanced search and select 'only closed auctions'.

It doesn't go back all that far, but it's better than nothing.

Posted by Kevin on April 28th, 2005


In comp.sys.mac.misc Randy Howard <randyhoward@fooverizonbar.net> wrote:
Ga Tech had several nobel nominated physics instructors who found
the undergrad teaching beneath their status. One derived Einstein's
equation in the first five minutes of class and asked if their were
any questions. No one bothered of course.

His hour long tests always had the same format. Five questions, multiple
choice. No one ever finished. Lorentz time dilation questions had answers
like 0.5/sqrt(2), -0.5/sqrt(2), 1/sqrt(2), and -1/sqrt(2). The scores
were a histogram. 20% - 10 students, 40% - 40 students, 60% - 20 students,
80% - 10 students, 100% - 2 students.

Students were allowed to take a calculator and a pencil. This was
the dawning of the text enabled calculators. The HP 48SX was the
calc of choice. The teacher either didn't understand or didn't care
that the calcs were terrific for cheating. While we got a few
constants on the test page, anyone with the HPSX had a physics book
full of constants. And while he was looking for someone to trip up
on a power of 2 or a negative sign, the HP programming never made the
trivial mistakes a pencil pusher did. A few people tried importing
textbook pages with the serial cable ... but that was too blatant.
They never did well.

I dunno. I despise HP because I didn't have one. RPN is a
bit nostalgic and elitist, kind of like emacs. To be fair, it does
eliminate parenthesis. But MatLab or Mathematica does a better job on
nearly any engineering problem.

You guys are NUTS for missing these calculators.



Posted by ed on April 28th, 2005


Kevin wrote:
<snip>

rpn is simply better and quicker for long or complex calculations.
compared to other calculators, even trivial equations such as:
(3+5) / (7-9)
can be entered quicker and easier.

sure matlab or mathematica do a better job, but they're not as quick,
easy, convenient, or portable.

how are you even judging if you didn't even have one?


Posted by Kevin on April 28th, 2005


In comp.sys.mac.advocacy ed <news@atwistedweb.com> wrote:
(3+5) / (7-9) = .... eleven key presses.
35+79-/ ... eleven key presses.

The stack recall buttons are definitely a plus on the models that
offer the feature. I'm not sure - do any infix calculators offer
the ability to undo?

Very debatable. I'll simply say it's probably more personal preference
than anything else.

True.

I should have said I didn't have one in my early undergrad days. They
definitely put the starving student at a disadvantage.

I owned an HP48 SX once the price dropped below $300.




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