[A83] Re: CAS
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[A83] Re: CAS
On the 89, ans in actually an array of all the answers stored on the screen
(you pick 10-100 in the mode menu) Usually, however, you can just paste it
in by hitting enter on one of the answers up top. It seems more precise
this way, even though the simplified answer is stored, and an approximation
is nly computed on demand. If you could have something that just did that,
only simplifying, not solving, until you did something like diamond+enter
(yeah, maybe second or alpha:) so that you could do systems or equations
more easily it would be great.
As for unit conversions, the 89 allows you to use units in your equations
and convert them when you wish. I've gone through several levels of an
equation, just having units sticking out in a bunch of places, unti lI had
it solve for the unit I was after, and iit came out, expediantly as
always. But you're right, the 89 interface is very different from the
previous calculators.
At 05:21 AM 8/24/2001 -0700, you wrote:
>It was just a random idea I had, and it'd be interesting to see someone do
>it, though it probably won't be me, unless I get some free time. I haven't
>really seen many "plugins" to the OS that are really useful. There were
>some for the 86 to do things like automatically run an assembly program
>without needing to type Asm(, but nothing more than that.
>
>I haven't thought much about exactly how to do it, but it'd be nice to get
>some input from people on that. Something like the pretty print on the 86
>would be very useful to me when doing math on it. Sure, I could just use my
>89, but I've always liked the 86, and it does useful things much easier than
>the 89, like unit conversions, and base conversions (though for that Windows
>Calculator is great :)
>
>A [sqrt]key program could be used, and provide a very efficient yet good
>interface. If the calc is at the homescreen, and no menu is open, then one
>or all of the F keys (they do nothing if no menu is open) could launch the
>app. It would pop up over the homescreen and show the last entered equation
>and result in pretty print, and/or the currently entered equation. Does the
>83 or 83+ have a hook of this sort? On the 86, you create a [sqrt]key
>program and set a flag, and that program gets run whenever a key is pressed
>in _get_key. Maybe a worthless key like F4/TRACE could be used.
>
>The pretty print code would be the same for both calcs, it'd just need
>different system code. I'm sure someone like Dan Englender would have no
>problem with that for the 83/83+.
>
>Your comment about the 89 is a bit funny. I can't ever remember using ANS
>on the 89, so I had to go check it out in VTI to see how it worked. The
>entry system on the 89 is completely different. There is an input line at
>the bottom, and the rest of the screen is the scrollback buffer. Kind of
>like a typical IRC chat client. Pressing up/down will scroll through the
>entries, both input and result. Pressing enter will paste the entry into
>the entry buffer. ANS can certainly be used, but generally things are
>entered differently. Things in the scrollback buffer do not contain ANS,
>but instead contain the value. Thus when things are pretty printed, they
>look as you'd expect.
>
>I hadn't thought about ANS, but it could be handled in the same manner
>rather easily. It could be optional to display variables as their name or
>their value.
>
>If you want a full CAS, go buy an 89 or a 92+. I've thought about the
>possibility of doing one for the 86, but it's kind of pointless. You'd be
>essentially replacing the OS, so you'd lose the clean interface that makes
>the 86 such a great calc. And the screen is smaller, so you don't have as
>much room for a scrollback buffer and pretty print. But just a pretty
>printer for one equation, now that would be nice.
>
> > I think that in this way you wouldn't be able to do more than 'pretty
> > print' the answers, like "12/59" (becomming 12, line, 59) and maybe give
> > things like the imaginary part a special place... It might also be
>possible
> > to 'pretty print' the the last entry, but what if you had used 'Ans' in
>the
> > equation? Then thing wouldn't be that usefull...
> >
> > As far as I know on the Ti89/92(+) the TIOS keeps track of how the formula
> > was built-up (replacing 'Ans' with the previous entry(s), etc.). And in
> > that way it can display some usefull info via the 'pretty print', so not
> > only the last thing you have typed.
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