Advanded CAS Functions

[Glenn]

All,

If you are interested in doing symbolic math on your CX CAS, I have
some functions that you can use.

There are laplace transforms in tf, latex conversions to calc in net,
if you use

http://www.artofproblemsolving.com/Forum/

Check out the Differential Equation Functions de\d,de\pd,de\dint

Check out the complex intergration i\ci. It is used to do the tf\iLp

http://gefisher.comxa.com/gindex.html

Click on the "My TI-Nspire Documents/MyLib

Click on the ReadMe file to get a text description of the functions

Have fun,
Glenn.

[Jim Fullerenex]

It's so kind of you, Glenn. I really need those. Thanks for your great work and generosity.

Best Wishes,

Jim Fullerenex

2011/7/22 Glenn <gefi...@mac.com>

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[Jim Fullerenex]

Some questions when I'm trying to use "al"

First of all, how's the "svineq" function different from the built-in solve that can also handle inequality? Second, when I'm trying al\svineq(sin(x^2-1/2)<=0,x) [actually this is the example you contained in the document]  it returns error "too few arguments" that occured at line 29.

Best Wishes,

Jim Fullerenex

2011/7/22 Jim Fullerenex <smoa...@gmail.com>

[Glenn]

Jim,

That is and error in the de\psol call. I added an argument so you
could specify the value to set the c<num> variables
and did not update svineq. It should be fixed now, just download "al"
again.

I also added a comment at the top of the "readme" file. Download it
again.

Thanks for the err check. I need those,
Glenn

On Jul 21, 8:22 pm, Jim Fullerenex <smoat...@gmail.com> wrote:
> Some questions when I'm trying to use "al"
> First of all, how's the "svineq" function different from the built-in solve
> that can also handle inequality? Second, when I'm trying
> al\svineq(sin(x^2-1/2)<=0,x) [actually this is the example you contained in
> the document]  it returns error "too few arguments" that occured at line 29.
>  Best Wishes,
> Jim Fullerenex
>

> 2011/7/22 Jim Fullerenex <smoat...@gmail.com>

>
> > It's so kind of you, Glenn. I really need those. Thanks for your great work
> > and generosity.
> > Best Wishes,
> > Jim Fullerenex
>

> > 2011/7/22 Glenn <gefis...@mac.com>

[Don Shepherd]

Joe, here are the Laplace transforms you have been crying for.

[Joe]

Crying for? I don't think so. The other two calculator companies
provide Laplace capability and have provided it for well over a decade
and the fact that TI doesn't, speaks volumes. Actually there are many
other options for Laplace transform work. In addition to doing it by
hand, I generally use my Hp50g for inverse Laplace transforms or Maple
if I am in a hurry. So it doesn't hurt me that TI produces a
mathematically non-competitive calculator. Quite frankly, it hurts
TI. In fact, I rather enjoy pointing out that TI doesn't have that
important math capability. My guess is that by not having Laplace
capability, TI has lost more in business than it would have cost them
to provide that capability. BTW, I am increasingly hearing rumors
that Casio is going to introduce a Prizm CAS model early next year and
that it will have an improved Classpad CAS. Does anyone have any
specifics on that? I think it is wise to save the coin and wait for
that product as opposed to buying an nspire cx cas now and maybe later
regreting that decision. Especially considering the Os updating
problems that nspires have had, and the incremental improvements that
can make the ti calc that you buy today obsolete tommorrow. Think
about it.

Good job Glenn! I think TI should buy your program and incorporates
it into their cas.

> > Glenn.- Hide quoted text -
>
> - Show quoted text -

[Eric Findlay]

Not crying as in "boo hoo," but rather, crying as in "shouting" or "demanding" is what he meant, which you have been.

--Eric

[Joe]

Good! Thats nice to know. Thanks for bringing it up Eric. And after
5+ years of nspire development by TI, maybe it is not to late to speak
up and make TI aware of some critical issues. Firstly of course what
is the logic(?) behind having some D.E. capability but leaving out the
much used and very important Laplace capability? And where is the 3d
graphing capability for lines and curves, and when is TI going to
produce a decent keyboard with adult sized keys that can be depressed
one at a time like the Prizm has? And don't you just hate the errors
that the dual purpose keys cause. I guess it is a waste of time to
mention Fourier transforms and the stuff that the other calc's can
do.

BTW, have you tried it? The prizm I mean. It's a very intuitive
which means that you can spend more time teaching math and less time
teaching which buttons to push and in addition to being more
intuitive, the Prizm costs less. Your school will really like that.

[Andy Kemp]

You do realise the irony or complaining about the TI-Npsire for things
that are also missing from the Prism don't you?

I haven't used the Prism but do have a 9860G (which is identical to
the prism apart from the colour, and the ability to import pictures!)

Prism has no CAS at all and therefore no DE or Laplace
Prism has no 3D Graphing
I'll give you the prism has bigger keys becuase to type any letters
you have use the alpha lock and double up across the keypad - which is
precisely the problem you were complaining about on the Nspire of dual
purpose keys in fact on the Prism most of the keys are triple purpose!

Likewise no fourier transforms on the Prism...

I quite like the casio calculators as basic graphing calculators but
they are basically the same calculators I used at school in the 90's,
they do have some neat features (I always liked their approach to
Graph Solving), but they are nowhere near as powerful or flexible as
the Nspire - Additionally the computer software for the Prism is
nowhere near as good as the Nspire software.

And to top it off in the UK the Prism is more expensive then the CX...
(and based on a quick glance only about $15-20 more in the US)

[Jim Fullerenex]

Just my words: Casio Prizm is way too inferior compared to TI Nspire CX, even the one without CAS 

Best Wishes,

Jim Fullerenex

2011/7/23 Andy Kemp <an...@kemp.co>

[Joe]

HI Andy,
I wasn't comparing the Prizm to the ti cas I was comparing the prizm
"keyboard" to the nspire "keyboard" but I did mention the Prizm with a
cas which I hear will be introduced. You may object to the alpha lock
but I just don't know how anyone can accurately use the tiny closely
spaced keys on the nspire. My finger tip contacts 3 keys at once so
how do you deal with that problem and how can you be certain which
entry you selected with the dual purpose keys that depend on pressure
on one side or the other. For an expensive calculator, the nspire
keyboard seems just plain cheap to me. No pun intended.

Clearly from a math functionality point of view, the Prizm must be
compared to the nspire cx, not the nspire cx cas and I was not trying
to indicate otherwise when comparing the two keyboards. Also, my
comments on the Prizm were for teachers who must use a non-cas
calculator because of the testing regulations.

Are you sure the Prizm is more expensive than the cx in the UK? Thats
quite surprising. Can you order from Amazon.com in the UK? I just
looked up the prices at Amazon.com and found the following:
Prizm: $120.86
Nspire cx: $143.38
That makes the nspire nearly 20% higher in price.

Speaking of Irony, I find it ironic that TI used to be the calculator
of choice because it had the easiest learning curve. Now with the
nspire products the situation has reversed. Why in the world TI came
out with the more complicated nspire series when they could have
improved their very popular ti-84/89 and Voyage200, and had great
products to sell, why they didn't do that I just don't understand but
perhaps that is not important. The important point is that without a
good keyboard and competitive math capability the nspires are just not
that attractive, especially and when you consider the high price and
complicated nature of the nspire products and the fact that you have
to go thru a whole new calculator learning curve.

So as I understand it, with TI you get periodic OS improvements that
can be a real pain in the az to deal with, and
with TI you get a keyboard but not a terribly good one, and
with TI you get some differential equation capability (with the cas
option) but a key portion is missing, and
with TI you get 3d graphing but not the ability to graph a 3d curve,
and
with TI they do offer a cas but leave out math capability that Casio
and Hp provide.
Whats with those people? Why do they consistently offer less than
first class capability to go with the first class price that they
charge? And where is the incentive to go thru the learning curve for
a totally new (nspire) calculator. It certainly can't be the nspire
programability. As for Lua, who needs the extra complication? The
average calculator user is not a software developer and would be
happier with something simple and easy to use. If the nspire was just
recently introduced I would expect these issues to be cleared up with
an improved model but with problems like this after about five years
of continuous development I don't think it is ever going to happen.
In fact I would not be surprized if the cx is the end of the line and
further development of the nspire series stops here.

[Lana Golembeski]

Actually I find the nspire cas much easier than the Ti 89. And young people have no problem picking up the nspire!

Sent from my iPhone
Lana

[j4e8a16n]

On 22 juil, 12:56, Don Shepherd <sheph...@iglou.com> wrote:
> Joe, here are the Laplace transforms you have been crying for.
>
> On Jul 21, 5:27 pm, Glenn <gefis...@mac.com> wrote:
>
>

Here . . .

[Eric Findlay]

I'd like to point out that Blackberrys have smaller keys which are closer together than the Nspire keys, and according to recent numbers, Blackberrys account for 36% of smart phones in the US, and about 19% worldwide.

This age of texting and smart phones with full keyboards shows that young people today can use smaller keys with great speed and accuracy, which may be TI's motivation behind the keyboard layout. Remember, TI is designing these things to be primarily used by the kids, so as long as they don't have a problem using it, it was well designed for its target consumer.

And for the rest of the people who don't like the keyboard, well, that's what the computer software is for.

--Eric (from my iPhone)

[Jim Fullerenex]

I think I'm a bit left in the dark: what on earth is wrong with the keyboard? In a sense, the Nspire keyboard is so user friendly that I think it far surpasses that of TI-89 (to tell the truth, that's one of the primary reasons I chose Nspire). Also I don't think the keyboard is designed solely for kids. At least theoretically, typing will be faster if the alphabetic keys are listed separately instead of piled up with sin() cos() keys or so.

Best Wishes,

Jim Fullerenex

2011/7/24 Eric Findlay <eagl...@duetsoftware.net>

[Lionel Debroux]

> I think I'm a bit left in the dark: what on earth is wrong with the
> keyboard? In a sense, the Nspire keyboard is so user friendly that I
> think it far surpasses that of TI-89 (to tell the truth, that's one
> of the primary reasons I chose Nspire).

On the contrary, I find it much easier to type generic text (with lots
of é, è, à and other accented letters), on the go, on the TI-Z80 and
TI-68k keyboards than on both the Nspire Clickpad or Nspire Touchpad
keyboards :)

Granted, I don't use my four Nspires much, and I'm very used to the
TI-68k keyboard, with which I have typed texts up to 10 KB at several
dozens of occasions over more than 10 years.
However, even with long small fingers, on the Clickpad, I make lots of
wrong keypresses (right or left of the small round alpha keys), and on
the Touchpad, the alpha keys are nearly as small but much closer to each
other. For fat-fingered users, the TI-Z80 and TI-68k keyboards must be
much more usable than Nspire keyboards.
For typing high amounts of texts, on all series (TI-Z80, TI-68k,
Nspire), emulators / computer software beat on-calc typing, of course.
But I don't have a netbook for quick notes taking on the go.

> Also I don't think the keyboard is designed solely for kids. At
> least theoretically, typing will be faster if the alphabetic keys
> are listed separately instead of piled up with sin() cos() keys
> or so.

Well, in my long experience writing generic text on the TI-68k keyboard,
I found that math keys and text keys don't mix up much. ln/e^x,
sin/sin^-1, cos/cos^-1, tan/tan^-1 are on the same keys as x, y, z and
t, three of which are not _that_ frequent in generic text ;)

And in math usage, the TI-68k keyboard gives direct access (one modifier
key + one key) to i, infinite, e, pi, theta, !, the six
equality/inequality comparisons, ln/e^x, sin/sin^-1, cos/cos^-1,
tan/tan^-1. Yesterday, I did some math tests on the Nspire CX CAS, and I
found that most of those require more than 2 keypresses on the Nspire.

Your mileage might vary, of course ;)

Lionel.

[Jim Fullerenex]

But I guess it is actually quite difficult for even fat-fingered people to mistype, given the stiffness of those alphabetic buttons, as compared to non-alphabetic keys that are "softer".

Anyway, I have not spent more than an hour with TI-89, but several of my friends complained to me the inconveniency of its piled-up keyboard (I mean, for typing text, not for entering sine and cosine expressions).

Just my words, not verified personally.

Best Wishes,

Jim Fullerenex

2011/7/24 Lionel Debroux <debroux...@gmail.com>

--

[Nevil Hopley]

Joe recently wrote....

" Are you sure the Prizm is more expensive than the cx in the UK?
 Thats
> quite surprising.  Can you order from Amazon.com in the UK?  I just
> looked up the prices at Amazon.com and found the following:
> Prizm: $120.86
> Nspire cx: $143.38
> That makes the nspire nearly 20% higher in price."

Not that I'm really that interested in making comparisons between such
vastly different platforms, but one thing to bear in mind are the
running costs of all handhelds.
The Prizm uses 4x AAA batteries, whilst Nspire CX uses USB-
rechargeable lithium.
I wonder how many sets of batteries would you go through before the
Nspire CX becomes 'cheaper to run'?

This is a snippet of information that is just as applicable when
encouraging students to purchase the new Nspire CX compared to Nspire
Touchpad greyscale handhelds, if they are concerned at the high
initial costs.

Nevil

[Jim Fullerenex]

That Nspire CX is more expensive than Prizm doesn't surprise me at all, given the far more powerful math and graphic capabilities of CX. I believe battery setup is just a minor point.

Best Wishes,

Jim Fullerenex

2011/8/11 Nevil Hopley <ne...@calculatorsoftware.co.uk>

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