Re: TI-M: TI-89 root question

To: ti-math@lists.ticalc.org
Subject: Re: TI-M: TI-89 root question
From: "Daniel Bishop" <danb2k@hotmail.com>
Date: Fri, 09 Jun 2000 18:20:02 GMT
Reply-To: ti-math@lists.ticalc.org

The superscripted -1 (reciprocal), 2 (square), and 3 (cube) have higher 
precedence than ^ on all TI calculators.  It's mentioned in the manual, so 
it's a "documented feature" and not a "bug."

>From: "Robert Mohr" <rmohr02@hotmail.com>
>Reply-To: ti-math@lists.ticalc.org
>To: ti-math@lists.ticalc.org
>Subject: Re: TI-M: TI-89 root question
>Date: Thu, 08 Jun 2000 11:07:11 EDT
>
>
>I didn't see any problem on the TI-86.  You have to put, say, 27^3 with the
>superscripted -1 right after it, but if you don't want to use the
>superscripted number for some reason, you have to do this:  27^(3^-1)
>
>
>----Original Message Follows----
>From: "Scott Noveck" <noveck@pluto.njcc.com>
>Reply-To: ti-math@lists.ticalc.org
>To: <ti-math@lists.ticalc.org>
>Subject: Re: TI-M: TI-89 root question
>Date: Wed, 7 Jun 2000 23:49:37 -0400
>
>
> > a^(1/n) =
> > a^(n^(-1)) = a^n^(-1) because ^ is highest prescedence and right
> > associative...(at least in standard arithmetic parsers, but I believe 
>the
> > TI-89 follows this convention too)
>
>Don't use that last form (a^n^-1) on the calcs.  There's a supposedly a bug
>in most ROM versions of most z80 calcs where the precedence of powers to
>powers is not evaluated correctly, and that may be taken as (a^n)^-1 rather
>than a^(n^-1).
>
>I'm not sure exactly which calcs this affects, but I remember HP listing 
>the
>HP49G's correct evaluation of this as a "feature" in which they claimed 
>that
>the HP48 line and all ti graphing calcs except the 89, 92(+), and I believe
>86 (one of the z80 calcs) all suffer from this incorrect evaluation.  I've
>got easy access to a friends' 82/83/83+/85/86 calcs in school, so maybe 
>I'll
>test it out tomorrow and post the results here.
>
>     -Scott
>
>
>
>
>--Robert Mohr--
>rmohr02@hotmail.com
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