Integration and limits issues

[Joe]

In addition to the desolve problem there are integration and limits
issues with OS 3.0 as indicated by TI here:

http://education.ti.com/educationportal/sites/US/nonProductSingle/updatenspire30.html

[Jimmy Fullerenex]

Symbolic Integrals

Using the symbolic integral function to solve certain classes of definite integrals may require TI-Nspire CAS handheld to take a long time to compute, e.g., Integral((2-x^3)^2-tan(x)^2,x,0,0.902) or .

Note: The Numeric Integral command (nInt()) can be used instead to find the numeric value of an integral

------The above is an excerpt from the TI official note indicated by Joe. But on my handheld I didn't see anything unusual; the hh processed swiftly and yielded a satisfying result. What exactly is the problem then? 

Cheers,

Jimmy Fullerenex

2011/5/2 Joe <wjb...@yahoo.com>

In addition to the desolve problem there are integration and limits
issues with OS 3.0 as indicated by TI here:

http://education.ti.com/educationportal/sites/US/nonProductSingle/updatenspire30.html

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[hastern]

"may require" != "will require"

On May 2, 1:02 am, Jimmy Fullerenex <smoat...@gmail.com> wrote:
> *Symbolic Integrals*

>
> Using the symbolic integral function to solve certain classes of definite
> integrals may require TI-Nspire CAS handheld to take a long time to compute,

> e.g., Integral((2-x^3)^2-tan(x)^2,x,0,0.902) or .

> Note: The Numeric Integral command (nInt()) can be used instead to find the
> numeric value of an integral
>
> ------The above is an excerpt from the TI official note indicated by Joe.
> But on my handheld I didn't see anything unusual; the hh processed swiftly
> and yielded a satisfying result. What exactly is the problem then?
> Cheers,
> Jimmy Fullerenex
>
> 2011/5/2 Joe <wjb...@yahoo.com>
>
>
>
>
>
>
>
> > In addition to the desolve problem there are integration and limits
> > issues with OS 3.0 as indicated by TI here:
>

> >http://education.ti.com/educationportal/sites/US/nonProductSingle/upd...

[Joe]

"I didn't see anything unusual; the hh processed swiftly
and yielded a satisfying result. What exactly is the problem then?"

That was my experience also. Additionally I worked the problem on a
voyage 200 which should be much slower but it returned the answer
quite quickly. hastern wrote: "may require" != "will require" So is
the point that the integral is not slow now but will be when the next
os version comes out in a couple of weeks? I would think that if that
is what ti means that is what they would have said. I wonder if there
is a communication problem here. Like maybe someone at ti in
engineering discovered a problem and then someone else at ti who wrote
that communication is in marketing and consequently picked a poor
example to illustrate the problem?

[Jimmy Fullerenex]

I can't agree with you more, Joe!  :-)

Cheers,

Jimmy Fullerenex

2011/5/3 Joe <wjb...@yahoo.com>

--

[Nelson Sousa]

"may require" != "will require"

"may require" : will be slow in some circumstances, detected by some users
"will require" : is always slow, regardless of circumstances,
regardless of users.

Just because you didn't detect it doesn't mean the problem isn't there.

Nelson

[Joe]

True. The question is under what circumstances does the problem
occur? If we don't know under what circumstances the problem occurs
how will we know if the problem gets fixed or not? Why would TI to
report a problem with their product in such a way that we cannot
verifiy it until we stumble upon it occurring?

On May 3, 7:59 am, Nelson Sousa <nso...@gmail.com> wrote:
> "may require" != "will require"
>

> >http://lafacroft.com/archive/nspire.php- Hide quoted text -
>
> - Show quoted text -

[Lionel Debroux]

> > "may require" != "will require"
> >
> > "may require" : will be slow in some circumstances, detected by
> > some users
> > "will require" : is always slow, regardless of circumstances,
> > regardless of users.
> >
> > Just because you didn't detect it doesn't mean the problem isn't
> > there.
> >
> > Nelson

> True. The question is under what circumstances does the problem
> occur? If we don't know under what circumstances the problem
> occurs how will we know if the problem gets fixed or not? Why
> would TI to report a problem with their product in such a way that
> we cannot verifiy it until we stumble upon it occurring?

FWIW, the text and image in
http://education.ti.com/educationportal/sites/US/nonProductSingle/updatenspire30.html
are different expressions, and one seems to be more troublesome than the
other one.
Spotted (at least) by TI-Bank:
http://ti.bank.free.fr/index.php?mod=news&ac=commentaires&id=1075

Lionel.