[TI-M] Re: Derivative on 83+

To: ti-math@lists.ticalc.org
Subject: [TI-M] Re: Derivative on 83+
From: Jonas Jacobsson <jonas@cytech.nu>
Date: Wed, 04 Sep 2002 07:47:18 +0200
References: <20020903234937.67600.qmail@web12304.mail.yahoo.com>
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jeff wrote:
> haven't used an 83+ in a _very_ long time, but it looks to me like your problem is that y1 is not
> a string, while the derivative function wants a string.  okay, i've stolen my sister's 83+ and it
> looks like the equ->string function stores its result to a variable; it doesn't return a value. 
> so if you wanted to you could do y2=d(Str1,"x") and then on the homescreen do
> Equ->String(Y1,Str1).  not sure if that's worth doing, though.  as for drawing a tangent line
> (which i think is what you wanted to do), i'm sure there's a way to do it somehow using the
> features of symbolic to manipulate your derivative, but i don't know enough about it to say. 
> there is a built in tangent function though - Tangent(Y1,xval).

Ah, yes, Tangent() did the job I was searching for, but it's just a draw
function, so it is not possible to trace or use later in any other way.

/jonas

References:

[TI-M] Re: Derivative on 83+

From: jeff <jefromi42@yahoo.com>