I did some symbolic calculations using inverse Laplace transform. I've
got a function that describes how a circuit works and now I want to
enter it into Matlab to do numeric calculations and to build graphs.
The problem is that my function is very big and if I enter it manually
I can make too many errors. So the question is how can I transfer a
formula from HP 50g to Matlab or to make it simple, how do I save a
formula on 50g as text file?
IIRC some special Filer version can even save strings
without binary prefixes to SD cards, but in general
there will otherwise be a 13-byte prefix to delete from files
if "strings" are stored or transferred in a "binary" mode.
Using transfer software in "ascii" mode, one gets some different
extraneous characters, but those are plain text and easier to edit as text.
In addition, not all possible syntax in the HP calc CAS
need coincide with the equivalent syntax in another CAS,
and of course there are special calculator symbols which may differ,
so there remains the possible need for other additional editing.
> I use 64-bit version of Windows 7.
> Is there any way to save the string on SD card in ASCII format?
"Ascii format" may not be what you expect,
or what Matlab can directly use.
Any calculator formula or UserRPL program, however,
may be converted to a string object by the \->STR command.
Any calculator string object that you can read
can be saved on the SD card, using the built-in character set,
which is mostly ISO-8859-1 with additional math and program symbols
in undefined sections of that character set.
Any "hex editor" can be used to remove the first 13 bytes
of the object that was saved on the card ("HPHP49-xBBBBB"
where x is a letter and BBBBB are binary byte values)
which leaves you with the original character string,
or you can try "Filer6" in the calculator, which may be able
to store the "bare" string directly on the SD card:
<http://www.hpcalc.org/search.php?query=filer6>
The calculator has an additional concept called
"ascii translation," which can represent special characters
that are undefined in ISO-8859-1 by \xx or \nnn
Formula examples: \pi and \GS (pi and Greek [uppercase] Sigma).
Program examples: \<< \->STR \>>
Such "ascii translation" allows posting or saving
any programs and formulas using only universal ascii text,
but it may require translating back again into the calculator's
more complete internal symbol set to handle the complete universe
of all possible mathematical formulas and calculator programs.
I don't know how elementary or complex are your formulas,
nor how Matlab expresses the more complex of formulas and functions,
which may differ from the calculator's internal syntax,
so I don't know what approach will prove best for you.
FWIW, the following article happens to supply calculator programs
which can export all internal formulas and UserRPL programs
in "ascii translated" form, and can also import those again:
Interesting things about that article are that its first short program
can be used to import all the other programs offered in the article,
and also that the first two short programs do almost everything
that most people need, so there's no need to import all the others anyway :)
Thank you very much for the answer. My formulas don't contain only
EXP() functions. Using \->STR, saving to SD card and then removing the
first characters is a perfect solution.
On Jan 25, 6:26 am, Dima <iosaa...@gmail.com> wrote:
> Thank you very much for the answer. My formulas don't contain only
> EXP() functions. Using \->STR, saving to SD card and then removing the
> first characters is a perfect solution.
Hello Dima and Mr Meyers
I have Droid48 emulator on an Android phone. I am desparate to be able
to transfer/convert program file from calculator to computer (text
format for editing) and back.
I have read of Dima's success. I am familiar with the HP calculator,
but not the file utilities. My calculator has port 1 and port 2
identified. I did successfuly transfer a program from bottom level of
stack to port 2 using :2:outname STO. But then what? The only files
that show in my .hp48 directory are:
hp48
port1
port2
ram
rom
None of these files are readable on my pc. (I haven't tried the hex
reader yet... should I use that on these?).
By the way I also tried to backup my directory using Memory/Next/Archi
as suggested in HP48 user manual. However there is no Archi in that
menu on Droid48, and it does not seem to recognize when I type in
Archi using alpha keyboard.
Next step, I tried to type into my Droid48 the program that Mr. Meyers
posted in 2007
\<< \->STR 3 TRANSIO RCLF SIZE 3 >
#2F34Dh #3016Bh IFTE SYSEVAL + STR\-> \>> 'IN' STO
I got stuck at the ">" sign. It does not exist on my keyboard. Is that
part of HP48 keyboard? Where does it hide.
Thanks for your patience. Any assistance would be greatly appreciated.
> I tried to backup my [HOME] directory using Memory/Next/Archi
> as suggested in HP48 user manual. However there is no Archi in that
> menu on Droid48, and it does not seem to recognize when I type in
> Archi using alpha keyboard.
What do you see on HP48G/GX after
Left shift, Memory[VAR] NXT
Command names such as ARCHIVE and RESTORE
are truncated to fit into menu key labels.
However, right shift cursor-down ["Review"]
is provided to show complete labels on the screen.
> I got stuck at the ">" sign. It does not exist on my keyboard.
Try right shift CHARS[PRG] [-64] [-64]
When you highlight the > character,
you will also see, on the screen
Key: Alpha right shift 2
which provides another way to enter the character on 48G/GX.
In alpha mode, try each of left shift, right shift
with each of keys 1, 2, 3
for an interesting group of symbols.
Further review of a downloadable manual might be helpful.
> > [electricpete]I tried to backup my [HOME] directory using Memory/Next/Archi
> > as suggested in HP48 user manual. However there is no Archi in that
> > menu on Droid48, and it does not seem to recognize when I type in
> > Archi using alpha keyboard.
> [John Meyers]What do you see on HP48G/GX after
> Left shift, Memory[VAR] NXT
There it is. ARCHI. I was pressing green-right-shift- Memory[VAR]
rather than purple-red-shift-Memory[VAR].
Seemed logical since Memory is written in green as if to be invoked by
the green shift key.
Rookie mistake, I guess. Thanks for setting me straight.
> > [electricpete wrote]I got stuck at the ">" sign. It does not exist on my keyboard.
> [Johnm Meyers wrote:]Try right shift CHARS[PRG] [-64] [-64]
That did the trick. And that first "IN" program enabled me to input
and execute program file that I had created on my computer, which is
what I've been having so much trouble with.
Thanks to you for your help and thanks to whoever wrote that IN
program!
> [Johnm Meyers wrote:]Further review of a downloadable manual might be helpful.
Tactful, but I get your point. This forum is a great resource which I
hope to take advantage of again, but will try to use it wisely.
Thanks again.
>> What do you see on HP48G/GX after
>> Left shift, Memory[VAR] NXT
> There it is. ARCHI. I was pressing green-right-shift- Memory[VAR]
> rather than purple-red-shift-Memory[VAR].
> Seemed logical since Memory is written in green
> as if to be invoked by the green shift key.
Many of the HP48G/GX green keyboard labels are intended to be used
both with left shift for a menu of programming commands,
and with right shift for built-in special operations.
This applies to all of the labels above digit keys 1-9
and to four labels in the second key row -- apparently
to every case where _only_ a green label appears above a key.
Wasn't that rather clever on the part of the original designers?
Like the Dead Sea Scrolls, however, all that knowledge
remained unknown to later civilizations,
until someone finally found those scrolls and read them :)
"Full many a gem of purest ray serene
The dark unfathom'd caves of ocean bear:
Full many a flower is born to blush unseen,
And waste its sweetness on the desert air."
o Use left shift for a menu of programming commands.
o Use right shift to launch built-in applications.
Other built in "secrets" where shift keys work with menus
(these may work even with HP49/50 series):
o Shift keys will generate commands to STO/RCL variables
when used with the VAR menu.
o Shift keys will generate commands to set/clear system flags
corresponding to "Mode" menu keys.
o Shift keys will generate complete program structures with
IF, CASE, START, FOR, DO, WHILE, etc.
> >> What do you see on HP48G/GX after
> >> Left shift, Memory[VAR] NXT
> > There it is. ARCHI. I was pressing green-right-shift- Memory[VAR]
> > rather than purple-red-shift-Memory[VAR].
> > Seemed logical since Memory is written in green
> > as if to be invoked by the green shift key.
> Many of the HP48G/GX green keyboard labels are intended to be used
> both with left shift for a menu of programming commands,
> and with right shift for built-in special operations.
> This applies to all of the labels above digit keys 1-9
> and to four labels in the second key row -- apparently
> to every case where _only_ a green label appears above a key.
> Wasn't that rather clever on the part of the original designers?
> Like the Dead Sea Scrolls, however, all that knowledge
> remained unknown to later civilizations,
> until someone finally found those scrolls and read them :)
> "Full many a gem of purest ray serene
> The dark unfathom'd caves of ocean bear:
> Full many a flower is born to blush unseen,
> And waste its sweetness on the desert air."
"dead sea scrolls"... funny!. There surely are a lot of secrets and
power hidden in this "ancient" device.
Once explained, with a little reflection, even a newbie like me can
see there is some logic to the approach.
Using the shift keys (mentioned in your other response) will save a
few keystrokes on frequently-performed operation of storing values
into variables.
Thanks again for your help!
