50g

> From: Jose J Martinez <jose_j_martinez@...>
> Subject: [50g] HP 27S Solver & HP 50g Solver
> To: 50g@yahoogroups.com
> Date: Wednesday, July 16, 2008, 11:45 PM
> Back in the old days(early 90's) at San Diego State
> University I used 
> an HP27S to get awesome grades in all of my statistics and
> business 
> classes.  I and a few of my study buddies would enter all
> kinds of 
> equations within equations with tons of variables before
> every test. 
> The instructors actually encouraged us to do this.  One
> time, while I 
> was doing an intership at the IRS, I even created an
> equation that 
> would figure out your taxes (1040 with deductions and
> more!).  All of 
> these equations were lost many years ago because I would
> always 
> forget to replace the batteries.
> 
> Anyway, the solver on the 27s was fairly simple to use
> compared to 
> what is on the HP50g.  I love the way a 50g can create
> graphs and the 
> feel of the buttons.  I've learned to use the equation
> writer and it 
> is great at displaying equations in textbook style!  But,
> I've yet to 
> figure out how to write a simple equation and retrieve it
> for later 
> use.  For example, I'd like to enter the quadratic
> equation and be 
> able to use it from time to time.  Any pointers would be
> greatly 
> appreciated.  I do have a copy of the User's Manual and
> User's Guide 
> in .pdf form.
> 
> Quadratic Equation (one each for +/-):
> 
> 1. 
> x=(-b+Sqrt(b^2-4ac))/2a
> 
> 2.
> x=(-b-Sqrt(b^2-4ac))/2a
> 
> Thanks in Advance

> From: Don Hart <ddhart1@...>
> Subject: Re: [50g] HP 27S Solver & HP 50g Solver
> To: 50g@yahoogroups.com
> Date: Thursday, July 17, 2008, 9:50 PM
> There are different ways to do your quadratic problem. A
> quick & dirty way is to use the DEF command.
> 
> enter 'PLUS(A,B,C)=(-B+(B^2-4*A*C)^.5)/2*A'
> press the DEF key on your keyboard
> You'll see PLUS as one of your menu keys.
> enter e.g. 1 -2 -3 on the stack and press that PLUS soft
> key and the function will be evaluated.
> 
> You can do the same with the negative part...
> 'MINUS(A,B,C)=(-B-(B^2-4*A*C)^.5)/2*A'
> 
> 
> --- On Wed, 7/16/08, Jose J Martinez
> <jose_j_martinez@...> wrote:
> 
> > From: Jose J Martinez
> <jose_j_martinez@...>
> > Subject: [50g] HP 27S Solver & HP 50g Solver
> > To: 50g@yahoogroups.com
> > Date: Wednesday, July 16, 2008, 11:45 PM
> > Back in the old days(early 90's) at San Diego
> State
> > University I used 
> > an HP27S to get awesome grades in all of my statistics
> and
> > business 
> > classes.  I and a few of my study buddies would enter
> all
> > kinds of 
> > equations within equations with tons of variables
> before
> > every test. 
> > The instructors actually encouraged us to do this. 
> One
> > time, while I 
> > was doing an intership at the IRS, I even created an
> > equation that 
> > would figure out your taxes (1040 with deductions and
> > more!).  All of 
> > these equations were lost many years ago because I
> would
> > always 
> > forget to replace the batteries.
> > 
> > Anyway, the solver on the 27s was fairly simple to use
> > compared to 
> > what is on the HP50g.  I love the way a 50g can create
> > graphs and the 
> > feel of the buttons.  I've learned to use the
> equation
> > writer and it 
> > is great at displaying equations in textbook style! 
> But,
> > I've yet to 
> > figure out how to write a simple equation and retrieve
> it
> > for later 
> > use.  For example, I'd like to enter the quadratic
> > equation and be 
> > able to use it from time to time.  Any pointers would
> be
> > greatly 
> > appreciated.  I do have a copy of the User's
> Manual and
> > User's Guide 
> > in .pdf form.
> > 
> > Quadratic Equation (one each for +/-):
> > 
> > 1. 
> > x=(-b+Sqrt(b^2-4ac))/2a
> > 
> > 2.
> > x=(-b-Sqrt(b^2-4ac))/2a
> > 
> > Thanks in Advance
> 
> 
> 
>       
> 
> ------------------------------------
> 
> Yahoo! Groups Links
> 
> 
>

Thanks Don & Mike,

I am starting to miss my HP27s less and less. Though, I'm not sure
about RPN yet. I keep goofing up the input! Anyway, your help and
Chapter 21 of the user's guide is helping out a lot. I am going to
confess that I almost gave up on the HP 50g and started using the TI 84
Plus Silver (I own both). But, I couldn't get past the cheap buttons
on the TI. And, Obviously, the HP is a much better machine. I just
wish HP had as much support and lessons for their calculators like TI
does. TI has flooded the high schools and universities with their
calculators and has brainwashed the majority of high school math
teachers.

Jose Martinez
San Jacinto, CA

From: Jose J Martinez <jose_j_martinez@...>
Subject: [50g] HP 27S Solver & HP 50g Solver
To: 50g@yahoogroups.com
Date: Thursday, July 17, 2008, 1:45 AM






Back in the old days(early 90's) at San Diego State University I used 
an HP27S to get awesome grades in all of my statistics and business 
classes. I and a few of my study buddies would enter all kinds of 
equations within equations with tons of variables before every test. 
The instructors actually encouraged us to do this. One time, while I 
was doing an intership at the IRS, I even created an equation that 
would figure out your taxes (1040 with deductions and more!). All of 
these equations were lost many years ago because I would always 
forget to replace the batteries.

Anyway, the solver on the 27s was fairly simple to use compared to 
what is on the HP50g. I love the way a 50g can create graphs and the 
feel of the buttons. I've learned to use the equation writer and it 
is great at displaying equations in textbook style! But, I've yet to 
figure out how to write a simple equation and retrieve it for later 
use. For example, I'd like to enter the quadratic equation and be 
able to use it from time to time. Any pointers would be greatly 
appreciated. I do have a copy of the User's Manual and User's Guide 
in .pdf form.

Quadratic Equation (one each for +/-):

1. 
x=(-b+Sqrt(b^ 2-4ac))/2a

2.
x=(-b-Sqrt(b^ 2-4ac))/2a

Thanks in Advance

>
> i've used prog calcs since the hp55 and the ti57/59 and i find the hp50 an
> absolute nightmare to use--only an engineer would need it enough to put up
> having to use it. i'm not an engineer, but i'm a computer hobbyist from way
> back and am nearly immune to pain.
> i also have the ti89 titanium and it is no walk in the park either in that
> even if they put pretty icons of the apps in a menu, once you're in that app
> you still have to go look up what it wants for inputs and how to generate
> output.
> 
> hp used to be renowned for their quality and it was a sad day to see 'made
> in singapore' on an hp27s i bought although it's still one of my favorite
> calculators as to operation even though it literally eats expensive
> batteries and you can barely see the display. i wonder if any of the folks
> praising the 'quality' of the hp50 have even worked on an hp35, 45, 55 &c.
> the new hp35 're-issue' was a welcome attempt and it indeed brings back fond
> memories of when hp wrote the book on calculator quality, but the interface
> and programming are not good and i myself found a bug in it and when it
> comes down to me finding a bug hp missed, they are indeed in trouble.
> 
> anyway, why is he bitching so much i hear you say? i use symbolic algebra on
> both the ti and the hp and the hp50 is worth every penny for symbolic
> algebra and the equation library alone. but i'm getting way too old to
> memorize all these methods of keeping track of saving personal equations and
> adding and manipulating libraries. perhaps if i used the calculators on a
> daily basis i could keep up with all that, but just grabbing it once or
> twice a week to run some scenarios i'm reading about in a book i've gotten
> frustrated with having to go look up the simplest of operations. the ti89 is
> hardly any better and the keys and display are not as good as the hp50.
> 
> an analogy lies in ham radio handheld radios which are barely larger than a
> cigarette pack and have hundreds of modes and settings and functions and
> host rarely more than a telephone keypad and a few stray function keys. no
> one can remember all these operations either, but there are computer
> programs that are marvels of simplicity--you hook your handheld via usb and
> set it up the way you want it via the computer and then you only have to
> remember a minimum of keystrokes out in the field or there's usually no
> problem finding a laptop so you can re-program if needed.
> 
> and that's my complaint, why aren't t simple computer interfaces available
> for the calculators? the only ones i've found so far are barely more than
> file transfer, backup, or to run some simple commands. i want a program
> where i can simply type 'a=b/c' and tell it to re-arrange for 'c'. on the
> hp50 i have to take into account what mode i'm in, then i have to remember
> whether i have to put the input on the stack or not, and when to issue an
> 'isolate' command that is godknows where. and whether to delimit my entry,
> and, if so, with what characters. i can't remember what the procedure is on
> the ti59, but i know it's not intuitive either as i have to look up how to
> do it each time.
> 
> /guy
> 
> 
>