limit problem with HP49G
in [HP48]
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From: Olive on 6 Jun 2010 03:10 Hello, I have a HP49G in hand (not the latest calculator but anyway...). I have found a bug with the limit function. I ask the limit of (I use English name instead of symbols impossible to type in an ascii keyboard). sqrt(3x+2)-sqrt(3x+sqrt(x)) x=infinity The calculator answer +infinity while the correct answer is -1/(2*sqrt(3)) If this kind of bug known? Are the corrected in some firmware version? Olive
From: Virgil on 6 Jun 2010 04:44 In article <20100606111057.148d4256(a)pcolivier.chezmoi.net>, Olive <not0read0765(a)yopmail.com> wrote: > Hello, > > I have a HP49G in hand (not the latest calculator but anyway...). I > have found a bug with the limit function. I ask the limit of (I use > English name instead of symbols impossible to type in an ascii > keyboard). > > sqrt(3x+2)-sqrt(3x+sqrt(x)) > x=infinity > > The calculator answer > +infinity > > while the correct answer is -1/(2*sqrt(3)) > > If this kind of bug known? Are the corrected in some firmware version? > > Olive My hp50 returns -(sqrt(3)/6) for that limit, which equal to your -1/(2*sqrt(3))
From: Merciadri Luca on 6 Jun 2010 09:07 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Olive <not0read0765(a)yopmail.com> writes: > Hello, > > I have a HP49G in hand (not the latest calculator but anyway...). I > have found a bug with the limit function. I ask the limit of (I use > English name instead of symbols impossible to type in an ascii > keyboard). > > sqrt(3x+2)-sqrt(3x+sqrt(x)) > x=infinity > > The calculator answer > +infinity > > while the correct answer is -1/(2*sqrt(3)) > > If this kind of bug known? Are the corrected in some firmware version? Same here (but still with HP 50g). - -- Merciadri Luca See http://www.student.montefiore.ulg.ac.be/~merciadri/ - -- The difference between genius and stupidity is that genius has its limits. (Albert Einstein) -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) Comment: Processed by Mailcrypt 3.5.8 <http://mailcrypt.sourceforge.net/> iEYEARECAAYFAkwLnXcACgkQM0LLzLt8Mhz9WACfd1TkWR4OhKAUMUNeg/cOv8Q4 SioAn1HskwDMg5tFT7s2msnyCIul5Qag =6LEH -----END PGP SIGNATURE-----
From: John H Meyers on 6 Jun 2010 22:53 On 6/6/2010 2:10 AM, Olive wrote: > I have a HP49G in hand What are the results of each of these separate commands: VERSION (the main ROM version) VER (the CAS version) > Are bugs corrected in some firmware version? It is possible to update a 49G to version 2.09 or 2.10, with CAS version up to 4.20060919, using a Windows 49G emulator (Emu48) with one of those ROM versions on a computer having a serial port to send its ROM to the real 49G, just as any real 49G can send its ROM to another 49G over a serial cable. The following contains a "vger.flash" file for direct transfer to a 49G -- it's a modified ROM with slightly different (and extra) "spreadsheet" and "Geometry" applications: ftp://ftp-fourier.ujf-grenoble.fr/xcas/hpcas/hp49g.zip http://www-fourier.ujf-grenoble.fr/~parisse/calc/hp49g.zip I don't know whether this file is earlier or later, only that it is different: ftp://ftp-fourier.ujf-grenoble.fr/xcas/hpcas/Vger.flash The above files can be found explained under "HP49/50 Intera[c]tive Geometry" at http://www-fourier.ujf-grenoble.fr/~parisse/english.html ou http://www-fourier.ujf-grenoble.fr/~parisse/francais.html [r->] [OFF]
From: Olive on 6 Jun 2010 23:47
On Sun, 06 Jun 2010 21:53:08 -0500 John H Meyers <jhmeyers(a)nomail.invalid> wrote: > On 6/6/2010 2:10 AM, Olive wrote: > > > I have a HP49G in hand > > What are the results of each of these separate commands: > > VERSION (the main ROM version) Version HP49-C Revision #1.18 Copyright HP 20000 > > VER (the CAS version) 4.2000031 > > > Are bugs corrected in some firmware version? > > It is possible to update a 49G to version 2.09 or 2.10, > with CAS version up to 4.20060919, > using a Windows 49G emulator (Emu48) with one of those ROM versions > on a computer having a serial port > to send its ROM to the real 49G, just as any real 49G > can send its ROM to another 49G over a serial cable. > > The following contains a "vger.flash" file for direct transfer > to a 49G -- it's a modified ROM with slightly different (and extra) > "spreadsheet" and "Geometry" applications: > ftp://ftp-fourier.ujf-grenoble.fr/xcas/hpcas/hp49g.zip > http://www-fourier.ujf-grenoble.fr/~parisse/calc/hp49g.zip I have no serial port in my computer for now. But I will try to find one. I would prefer to saty with an official HP version. Maybe I can try different firmware in the emulator before. Olive |