[TI-M] Re: Error/Too bad?

To: <ti-math@lists.ticalc.org>
Subject: [TI-M] Re: Error/Too bad?
From: Andy Selle <aselle@ticalc.org>
Date: Sat, 12 May 2001 19:02:46 +0200 (MET DST)
In-Reply-To: <20010512151707.21922.qmail@web1103.mail.yahoo.com>
Reply-To: ti-math@lists.ticalc.org

In fact, I think this behavior is a lot more sensical than just blurting
out an answer.  It happens a lot when there is some ambiguity in the
equation.  That is to say, it may depend on a piece of information
about the value of a variable.  A lot of times we implicitly assume
something is greater than zero, or is non-zero, etc.  The CAS shouldn't
make these same implicit assumptions.  In fact, in general, the TI
CAS is a little too forgiving.  For example, if you have an equation,
and you divide by x (where x is not defined as having a value).  It will
happily do it, and assume that x won't be zero.

-- 
Andy Selle <aselle@ticalc.org>
   Programming and System Administration, Survey Editor, Accounts Manager
   the ticalc.org project - http://www.ticalc.org/

On Sat, 12 May 2001, jeff wrote:

>
> Yeah, this is what happens if you give it a system of equations, with 2 variables (x,y) and no
> solution.  If you tell it to solve for {x,y} it will return false, but if you tell it to solve for
> just x it will return the equations.
> jeff
>
> --- Andy Selle <aselle@ticalc.org> wrote:
> >
> > I think the idea is that if the TI-89 can't figure out a decision
> > to make on something it just returns the expression.
> >
>
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References:

[TI-M] Re: Error/Too bad?

From: jeff <jefromi42@yahoo.com>