# HP 50g: Integration of EXP(-X^2)

• 04-20-2008, 11:36 AM
unix
HP 50g: Integration of EXP(-X^2)
Hello,

the Ti folks can integrate EXP(-X^2), e. g. from -infinity to
infinity. If I try this on my 50G this way:

* enter integral in equation editor, ENTER
* EVAL it (X becomes Xt?!)
* ->NUM

.... it says "->NUM error: Overflow". With both borders real it works
though. How could I work around this problem and calculate this
integral with infinite borders?

Regards,

Björn

--
BOFH excuse #431:

Borg implants are failing

• 04-20-2008, 12:10 PM
unix
Re: HP 50g: Integration of EXP(-X^2)
On Sun, 20 Apr 2008 06:36:25 -0500, Bjoern Schliessmann wrote:
[color=blue]
> the TI folks can integrate EXP(-X^2) from -infinity to infinity.[/color]

'\.S(-\oo,\oo,EXP(-SQ(X)),X)' \->NUM

Result: 1.7724538509

Flags: { #7881A10201615FF1h #0 #5150410A214020h #0 }

[r->] [OFF]
• 04-21-2008, 10:14 PM
unix
Re: HP 50g: Integration of EXP(-X^2)
John H Meyers wrote:[color=blue]
> On Sun, 20 Apr 2008 06:36:25 -0500, Bjoern Schliessmann wrote:
>[color=green]
>> the TI folks can integrate EXP(-X^2) from -infinity to infinity.[/color]
>
> '\.S(-\oo,\oo,EXP(-SQ(X)),X)' \->NUM
>
> Result: 1.7724538509[/color]

Thanks. Unfortunately, this gave me an overflow error just as
before ...
[color=blue]
> Flags: { #7881A10201615FF1h #0 #5150410A214020h #0 }[/color]

So some flags may be set wrongly -- how can I correlate the menu
entries with those numbers?
[color=blue]
> [r->] [OFF][/color]

I'm sorry, I don't understand. What should be turned off, is it

Regards,

Björn

--
BOFH excuse #23:

improperly oriented keyboard

• 04-21-2008, 11:18 PM
unix
Re: HP 50g: Integration of EXP(-X^2)
Bjoern Schliessmann WROTE:[color=blue]
> John H Meyers wrote:[/color]
[color=blue][color=green]
>> [r->] [OFF][/color]
>
> I'm sorry, I don't understand. What should be turned off, is it

I vote for having this text on the next probe to outer space, who is
with me?

Thomas

--

All your base are belong to us
• 04-22-2008, 03:30 AM
unix
Re: HP 50g: Integration of EXP(-X^2)
On Apr 21, 6:14*pm, Bjoern Schliessmann <usenet-
mail-0306.20.chr0n...@spamgourmet.com> wrote:[color=blue]
> John H Meyers wrote:[color=green]
> > On Sun, 20 Apr 2008 06:36:25 -0500, Bjoern Schliessmann wrote:[/color]
>[color=green][color=darkred]
> >> the TI folks can integrate EXP(-X^2) from -infinity to infinity.[/color][/color]
>[color=green]
> > '\.S(-\oo,\oo,EXP(-SQ(X)),X)' \->NUM[/color]
>[color=green]
> > Result: 1.7724538509[/color]
>
> Thanks. Unfortunately, this gave me an overflow error just as
> before ...
>[color=green]
> > Flags: { #7881A10201615FF1h #0 #5150410A214020h #0 }[/color]
>
> So some flags may be set wrongly -- how can I correlate the menu
> entries with those numbers?[/color]

The easiest thing to do would be to set those flags as he had the,
using STOF,
and slowly change flags back to your preferred settings, trying the
calculation after every few changes to find out where the problem is.

[color=blue][color=green]
> > [r->] [OFF][/color]
>
> I'm sorry, I don't understand. What should be turned off, is it

That is just one of John H Meyer's signature lines. It stands for the
rightshift "OFF" (ON key) combination that turns the calculator off.
As far as I can tell, that means he actually tested what he talked
about on his calculator, and since he is done, he turns it off.

[color=blue]
> Regards,
>
> Björn
>
> --
> BOFH excuse #23:
>
> improperly oriented keyboard[/color]

• 04-22-2008, 11:58 AM
unix
Re: HP 50g: Integration of EXP(-X^2)
On Mon, 21 Apr 2008 22:30:34 -0500:
[color=blue]
> That is just one of John H Meyers' signature lines. It stands for the
> rightshift "OFF" (ON key) combination that turns the calculator off.
> As far as I can tell, that means he actually tested what he talked
> about on his calculator, and since he is done, he turns it off.[/color]

Did anyone ever have a battery-operated "coffin" coin bank,
which, when a coin was placed on a slot on top, would start rocking,
then a lid would open and ghoulish hand would emerge, reach up,
snatch the coin, and then retreat back into the "coffin,"
thus closing the lid and turning itself off?

That's [r->] [OFF]

---

Everyone has a USB mouse, but who has a USB hamster?

Intel vs. AMD (do not do this in-flight)

..
• 04-22-2008, 12:14 PM
unix
Re: HP 50g: Integration of EXP(-X^2)
On Mon, 21 Apr 2008 17:14:08 -0500, Bjoern Schliessmann wrote:
[color=blue][color=green]
>> '\.S(-\oo,\oo,EXP(-SQ(X)),X)' \->NUM
>> Result: 1.7724538509
>> Flags: { #7881A10201615FF1h #0 #5150410A214020h #0 }[/color][/color]
[color=blue]
> Unfortunately, this gave me an overflow error just as before ...[/color]

You didn't first store the flag list (STOF command).

It will suffice to first do the CASCFG command,
also clear flags -20 and -21 (Underflow/Overflow).

but just want to get a "second opinion" from calculators
that know more than we do :)

[r->] [OFF]
• 04-22-2008, 01:18 PM
unix
Re: HP 50g: Integration of EXP(-X^2)
John H Meyers wrote:[color=blue]
> On Mon, 21 Apr 2008 17:14:08 -0500, Bjoern Schliessmann wrote:[/color]
[color=blue][color=green]
>> Unfortunately, this gave me an overflow error just as before ...[/color]
>
> You didn't first store the flag list (STOF command).[/color]

Ah, ok!
[color=blue]
> It will suffice to first do the CASCFG command,
> also clear flags -20 and -21 (Underflow/Overflow).[/color]

Well, what do you know, that did it! :) Thank you very much.

I already noticed the flag, but I didn't realize it could matter.
[color=blue]
> but just want to get a "second opinion" from calculators
> that know more than we do :)[/color]

Er, sure ;) Just wanted to try a Ti-optimized textbook problem on a
50g.
[color=blue]
> [r->] [OFF][/color]

(\me is a little bit embarassed)

Regards,

Björn

--
BOFH excuse #219:

Recursivity. Call back if it happens again.

• 04-22-2008, 01:21 PM
unix
Re: HP 50g: Integration of EXP(-X^2)
Thomas Becker wrote:[color=blue]
> Bjoern Schliessmann WROTE:[color=green]
>> John H Meyers wrote:[/color]
>[color=green][color=darkred]
>>> [r->] [OFF][/color]
>>
>> I'm sorry, I don't understand. What should be turned off, is it
>
> I vote for having this text on the next probe to outer space, who
> is with me?[/color]

Argl, please no :) The aliens will think all of us are /that/ slow
on the uptake.

OTOH, this could very well be a strategic advantage ...

Anyway, thanks everyone!

Regards,

Björn

--
BOFH excuse #259:

Someone's tie is caught in the printer, and if anything else gets
printed, he'll be in it too.

• 04-22-2008, 02:14 PM
unix
Re: HP 50g: Integration of EXP(-X^2)
On Apr 22, 7:58*am, "John H Meyers" <jhmey...@nomail.invalid> wrote:[color=blue]
> On Mon, 21 Apr 2008 22:30:34 -0500:
>[color=green]
> > That is just one of John H Meyers' signature lines. It stands for the
> > rightshift "OFF" (ON key) combination that turns the calculator off.
> > As far as I can tell, that means he actually tested what he talked
> > about on his calculator, and since he is done, he turns it off.[/color]
>
> Did anyone ever have a battery-operated "coffin" coin bank,
> which, when a coin was placed on a slot on top, would start rocking,
> then a lid would open and ghoulish hand would emerge, reach up,
> snatch the coin, and then retreat back into the "coffin,"
> thus closing the lid and turning itself off?
>
> That's [r->] [OFF]
>[/color]

VISTA:
You just equated a pictographic representation of the key presses used
to turn a calculator off (a method of conserving energy) with a cool
looking, but definitely not energy efficient coin storage device.
Cancel or Allow?