Re: A86: Symbolic program
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Re: A86: Symbolic program
I'm not sure exactly what it intercepts, but i think it has to do with any
printing to the homescreen, which includes more than just what i want. I
think I will have to control it all from the point where the calc begins to
parse it on (i.e. the rom won't get to do anything but parse). Therefore (i
need to do some more experimenting with sqrtPARSE) i think it could all be
accomplished by (a) defining a new type, and (b) intercepting all parses that
involve symbolics. This might be tough, because if they type:
::x^2+y^2::->A
::x::->B
sDer(A,B)
sqrtPARSE will need to know that A and B are symbolics...
David Phillips wrote:
> Doesn't sqrtHOME intercept calls to print to the home screen?
>
> At 12:21 AM 6/24/98 -0400, you wrote:
> >
> >I am just wondering about how others feel about the implementation of a
> >symbolics program. I've been doing some pre-planning and thinking and
> >experimenting, and all, and I have found that, imho, this would be the
> >best way:
> >
> >>From the command prompt, the user types in a command like:
> >::x^2+2*x::
> >Note that the symbolic is surrounded by 2 colons on each side. I did
> >this because (a) it is easily accessible by keyboard, (b) it woudn't
> >ever be used by anyone in their right mind from the command prompt
> >(someone confirm this), and (c) it should be pretty easy to intercept
> >with sqrtPARSE.
> >
> >This is what I have in mind. The user types in the symbolic. sqrtPARSE
> >intercepts it and evaluates it (I think that the best way would be to
> >turn it into postfix notation, as it is fast and easy to work with, at
> >least, that's what the hp48 does and it seems to do a pretty good job of
> >it). Anyway, I am not sure about how to represent this in Ans or
> >anything, so that the user can do something like sDer(Ans) or
> >sExpand(Ans). Any ideas would help. What needs to happen is the
> >postfix needs to be stored somehow, and then when it is displayed (if
> >there is any way to intercept the display it would be good) it is
> >converted back to algebraic.
> >
> >--
> >Stephen Hicks
> >mailto:shicks@mindspring.com
> >ICQ:5453914
> >IRC/AIM:Kupopo
> >Hopemage:http://www.mindspring.com/~shicks/
> >
> >
> >
>
> // David Phillips
> // mailto:electrum@tfs.net
> // ICQ: 13811951
> // AIM: electrum32
--
Stephen Hicks
mailto:shicks@mindspring.com
ICQ:5453914
IRC/AIM:Kupopo
Hopemage:http://www.mindspring.com/~shicks/
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