HP Forum Archive 21

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Focus on the HP50g Message #1 Posted by Mic on 21 Jan 2013, 3:25 a.m. 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 ?

Re: Focus on the HP50g Message #2 Posted by Walter B on 21 Jan 2013, 4:34 a.m., in response to message #1 by Mic 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:-)

Re: Focus on the HP50g Message #3 Posted by Mic on 21 Jan 2013, 7:06 a.m., in response to message #2 by Walter B I am not totally negative :)

Re: Focus on the HP50g Message #4 Posted by Eddie W. Shore on 21 Jan 2013, 7:52 a.m., in response to message #1 by Mic 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?

Re: Focus on the HP50g Message #5 Posted by Walter B on 21 Jan 2013, 8:18 a.m., in response to message #4 by Eddie W. Shore Look at the article and click, then look again ... d#-)

Re: Focus on the HP50g Message #6 Posted by Mic on 23 Jan 2013, 1:58 a.m., in response to message #4 by Eddie W. Shore Like this : http://www.calc-bank.com/index.php?mod=news&ac=commentaires&id=1678 Edited: 23 Jan 2013, 1:58 a.m.

Re: Focus on the HP50g Message #7 Posted by Eddie W. Shore on 23 Jan 2013, 7:45 a.m., in response to message #6 by Mic Quote: Like this : http://www.calc-bank.com/index.php?mod=news&ac=commentaires&id=1678 Thanks

Re: Focus on the HP50g Message #8 Posted by David Hayden on 23 Jan 2013, 10:47 p.m., in response to message #6 by Mic 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

Re: Focus on the HP50g Message #9 Posted by Chris Smith on 21 Jan 2013, 8:42 a.m., in response to message #1 by Mic 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?

Re: Focus on the HP50g Message #10 Posted by Eddie W. Shore on 23 Jan 2013, 7:44 a.m., in response to message #9 by Chris Smith 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.

Re: Focus on the HP50g Message #11 Posted by Tim Wessman on 21 Jan 2013, 12:06 p.m., in response to message #1 by Mic 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.

Re: Focus on the HP50g Message #12 Posted by Walter B on 21 Jan 2013, 1:23 p.m., in response to message #11 by Tim Wessman General integration limits 0 and 1 ?

Re: Focus on the HP50g Message #13 Posted by Tim Wessman on 21 Jan 2013, 5:58 p.m., in response to message #12 by Walter B To see if it will recognize the series representation in that one. Comes out to pi/12 if I remember. TW

Re: Focus on the HP50g Message #14 Posted by Ronald Williams on 22 Jan 2013, 9:18 p.m., in response to message #1 by Mic 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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