3 question on the HP50G
in [HP48]
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From: usenet1.20.quaxo on 24 Mar 2007 08:31 I have my new 50G since a few days, and I'm rather pleased... I think it's a great advance since the 48GX I had. I also like its "look'n'feel", the keyboard is OK though I miss some of the 48's keys (and the labels over the arrow keys!) I have some questions that bug me though... 1) If I have a very long integer (i.e. 100!) is there a way to display it "fullscreen", sort of like an "auto-wrap"? Everything I tried only shows just one line... 2) The expression "e^i*pi" only gives -1 if I'm in rad mode. Why is that? That kind of math may be above my level, but I thought e and pi were pure numbers, which should not depend on angle representation - so why should the equation's result change? 3) When I try to factor a non-factorizable expression (i.e. x^3+x^2+2x +5) the calc only displays the message "unable to factor" on the top line for a (small) fraction of a second... I had to actually push "factor" several times before realizing the calc was actually showing a message, and tens of times before being able to read it! 4) About libs... On the 48 I could use LS-2 to enter the libs menu where I found the ports list and commands, while with RS-2 I found the softkeys to launch the installed libs. On the 50G everything seems "mixed"... With RS-2 I find 3 softkeys to enter the ports 0,1,2, plus the softkeys for "some" of the installed libs, not all. If I enter port 0,1 or 2 I get the libs present in that port (the number, if you push that button the lib is copied in the stack) and "some" other installed libs (which are run if pushed). It's never clear what goes where, or how to install and (quickly) launch a lib. I found no explanations on the manuals. Sometimes an installed lib goes in the "Apps" menu... Sometimes it goes to the "main" libs menu... Sometimes to a specific port menu... Not really intuitive! I thank you in advance for any help! Cristian
From: ryan.edwards on 24 Mar 2007 17:29 On Mar 24, 5:31 am, usenet1.20.qu...(a)spamgourmet.com wrote: I too am a new HP 50 owner coming from a 48GX and I have noted exactly the same things as you. > 2) The expression "e^i*pi" only gives -1 if I'm in rad mode. Why is > that? That kind of math may be above my level, but I thought e and pi > were pure numbers, which should not depend on angle representation - > so why should the equation's result change? This one I do know. e^i*pi = -1 is Euler's Identity (pronounced "Oiler"). You can read about at Wikipedia here http://en.wikipedia.org/wiki/Euler%27s_identity The other concerns Christian has I would be very interested in hearing solutions for, especially how to make the first line of the stack wrap around in the same way MetaKernel on my 48GX did. - Ryan
From: Virgil on 24 Mar 2007 19:49 In article <1174771786.889492.284470(a)e65g2000hsc.googlegroups.com>, "ryan.edwards" <ryan.edwards(a)shaw.ca> wrote: > On Mar 24, 5:31 am, usenet1.20.qu...(a)spamgourmet.com wrote: > > I too am a new HP 50 owner coming from a 48GX and I have noted exactly > the same things as you. > > > 2) The expression "e^i*pi" only gives -1 if I'm in rad mode. Why is > > that? That kind of math may be above my level, but I thought e and pi > > were pure numbers, which should not depend on angle representation - > > so why should the equation's result change? > > This one I do know. e^i*pi = -1 is Euler's Identity (pronounced > "Oiler"). You can read about at Wikipedia here > http://en.wikipedia.org/wiki/Euler%27s_identity e^i*pi is slightly ambiguous as you are using it. I suspect you mean e^(i*pi), not (e^i)*pi. But as you have written it, HPs parses it as (e^i)*pi. On my HP49+, 'e^i*\pi, where \pi represents the pi symbol, evaluates to '\pi*EXP(i)' or (1.549740975483,2.64355906408) Whereas 'e^(i*\pi)' evaluates to -1. > > The other concerns Christian has I would be very interested in hearing > solutions for, especially how to make the first line of the stack wrap > around in the same way MetaKernel on my 48GX did. > > - Ryan
From: John H Meyers on 24 Mar 2007 23:04 On Sat, 24 Mar 2007 07:31:52 -0500, Cristian wrote: > About libs... On the 48 I could use LS-2 to enter the libs menu > where I found the ports list and commands, while with RS-2 > I found the softkeys to launch the installed libs. That was the 48G, that was :) http://en.wikipedia.org/wiki/That_Was_The_Week_That_Was > On the 50G everything seems "mixed"... > With RS-2 I find 3 softkeys to enter the ports 0,1,2, plus > the softkeys for "some" of the installed libs, not all. > If I enter port 0,1 or 2 I get the libs present in that port. The 49G[+]/50G/48Gii simply combines two of the 48G menus (library names menu, followed by port-number menu) into one single menu; otherwise it really works quite the same as in the Good Old Days. BTW, on both series, only "attached" libraries having names may be listed by name, while *all* objects in a port, each of which can be either named or numbered[libs], will appear in the port-number menus. Pressing a key in a "port-number" menu evaluates what's stored, just as if it were in the VAR menu; pressing a key in a menu of library names displays the command menu for that library (this was exactly the same in the 48G). [r->] [OFF]
From: John H Meyers on 25 Mar 2007 07:10
More about displaying library command menus: If a library is number 1234, then 1234 MENU will display the menu of its internal named commands, whether or not it has been "attached" to any directory. If you've entered a "port-number" menu, however, and see label [1234], then that's where the library as a whole is stored, and pressing that key simply recalls the entire library object to the stack, just like any other *data* object (a library as a whole is not "executable"; only its individual internal commands can be executed). Low "system" library numbers (e.g. built-in "Development" library 256) are not valid arguments for the MENU command, because low menu numbers are reserved for other built-in menus, but you can add 2048 to those library numbers to see their command menus; e.g. since 256+2048=2304, then 2304 MENU displays the "Development" library commands, even if that library hasn't been attached. > Sometimes an installed lib goes in the "Apps" menu... > Sometimes it goes to the "main" libs menu... Libraries can insert themselves into the new (49-series only) APPS menu, as does the "Development" library, when attached; internal "system" libraries are nameless and don't appear in the menu which lists library names -- the 48G[X] also had many such nameless internal libraries, but it also had no APPS menu, so they remained "silently within," as it were. > Sometimes to a specific port menu... "Port-number" menus show exactly what's been stored into that port number, just as the VAR menu shows what you have stored into variables; built-in libraries (like "Development" library 256) are in ROM, not in a port, and that's why you can not find them in "port" menus :) > Not really intuitive! Just logical, every step of the way, no? Although the reasons weren't familiar to begin with, hence appeared mysterious, does it all make sense now? By the way, try 2219 MENU on a 48G[X] *or* 49 series to see the menu of "invisible" ROM library 171, for example, which contains many of the commands first introduced in the 48G, which hadn't previously existed in the 48S[X]; since that library is in ROM, and all of these commands are always automatically recognized anyway, there is no need to ever display a stand-alone menu for that library. There are several more internal "system" libraries in ROM, which you can find listed in the "AUR" if interested. Hope this has been of interest -- "familiarity breeds content[ment]" :) [r->] [OFF] |