Focus on the HP50g



#2

Hello, I wrote anarticle about the current position of the HP50g :
http://www.calc-bank.com/index.php?mod=news&ac=commentaires&id=1812

What do you think about that ?


#3

Bonjour Mic,

That article would most probably start differently if written by an US-American ;-) No, no errors - but lacking that famous primary positive (marketing) attitude.

d:-)


#4

I am not totally negative :)

#5

Quote:
Hello, I wrote anarticle about the current position of the HP50g :
http://www.calc-bank.com/index.php?mod=news&ac=commentaires&id=1812

What do you think about that ?


Short and sweet. How did you get pictures of the developers?


#6

Look at the article and click, then look again ...

d#-)

#7

Like this :

http://www.calc-bank.com/index.php?mod=news&ac=commentaires&id=1678


Edited: 23 Jan 2013, 1:58 a.m.


#8

Quote:
Like this :

http://www.calc-bank.com/index.php?mod=news&ac=commentaires&id=1678


Thanks

#9

Regarding the easter eggs, I think HP removed some of them in the latest roms. I'm running 2.09 and I don't think the ON-F4 easter eggs are present on mine. Or maybe I'm just doing something wrong when trying to activate them.

Dave

#10

Sounds about right. I'm not sure ageing is an issue. Maths doesn't fundamentally change that much. In fact, my now ancient TI-85 is pretty good at "modern maths"...

Has anyone got a comparison between the 39g series and a 50g anywhere just out of interest?


#11

Quote:
Sounds about right. I'm not sure ageing is an issue. Maths doesn't fundamentally change that much. In fact, my now ancient TI-85 is pretty good at "modern maths"...

Has anyone got a comparison between the 39g series and a 50g anywhere just out of interest?


The comparison sounds like an interesting project.

#12

Been a while since I've looked at the capabilities of the CAS in the classpad. If you have time, could you test these ones out?

Thanks!

integrate(1/(x^2+9)^3,x)
integrate(1/(x^5+1),x)
integrate(e^-x^2,x)
integrate(ln(x+1)/x,x,0,1)
integrate(sqrt(x^2+1),x)
integrate(sqrt(tan(x)),x)
integrate(x*exp(a*x)*sin(b*x),x)

TW

Edited: 21 Jan 2013, 12:07 p.m.


#13

General integration limits 0 and 1 ?


#14

To see if it will recognize the series representation in that one. Comes out to pi/12 if I remember.

TW

#15

Quote:
Hello, I wrote anarticle about the current position of the HP50g :
http://www.calc-bank.com/index.php?mod=news&ac=commentaires&id=1812

What do you think about that ?


Hi Mic,
I found your example on limits to be an interesting choice of what the HP-50g can't do or can it solve the example with a slight re-write of the equation. Another question that came to my mind when looking at the example problem was what engineering discipline would find this equation useful?

To solve the example on the HP-50g just use the 'TAYLR' or 'TAYLOR0' function (on the same soft menu as 'lim') to re-write the equation in terms of x and then take the limit.

I'm not sure why the HP-50g requires this additional step but the shape of the function is somewhat unique for the x^4 denominator vs trying other powers of x in the denominator.

I did a little experimenting with limits close to zero on the HP-50g and found that you can find an approximate answer to the example by taking the limit at x= +/- 1/100.

I don't know what software/hardware you were using to verify the correct limit of -1/12 for this example but I found the TI-89 gives the correct result as well as WolframAlpha. However, what was surprising to me is that if you try different denominators of increasing powers of x, such as, x^5, X^6, X^7, X^8, X^9....X^44 the TI-89 fails to find a limit it reports 'undef' while the HP-50g finds all these limits without the additional step noted above and agrees with WofframAlpha for the limit values.

I don't think I found your article about the HP-50g unless it was about the hidden menus (Easter eggs). Was that it or did I miss something? Were you trying to promote HP-50g sales on Amazon?

The Easter Eggs are interesting but not new. I believe they have existed in various forms from the HP-48 through the HP-50g. For starters check out http://groups.google.com/group/comp.sys.hp48/browse_thread/thread/a1bf7a0607cb526/65bfa1c5264fc28b?lnk=gst&q=easter+eggs#65bfa1c5264fc28b

Ronald Williams


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