Date: Apr 4, 2008 6:37 PM
Author: Wouter Geelen
Subject: Re: Solving equation
email@example.com (Walter Roberson) wrote in
> In article <firstname.lastname@example.org>,
> Wouter Geelen <email@example.com> wrote:
> >I tried to do this myself but I can't get it done. I got
> >the following equation.
> >Ti = -1200*exp(-1/7200*t)+1200
> >Now I want to solve this function for Ti = 1080. So what
> >want to find is t. How do I do that :?
> Ti = -1200*exp(-1/7200*t)+1200, so
> Ti - 1200 = -1200 * exp(-t/7200), so
> (1200 - Ti)/1200 = exp(-t/7200), so
> ln((1200 - Ti)/1200) = -t/7200, so
> -ln(1200/(1200-Ti)) = -t/7200, so
> t = 7200 * ln(1200/(1200-Ti))
> Substituting in Ti = 1080, we get the result 7200 * ln(10)
> which is about 16578.61267.
> "Is there any thing whereof it may be said, See, this
is new? It hath
> been already of old time, which was before us." --
Hahahaha yeah I know it can be done by algabra I already
did myself lol but how do I this in matlab? Ain't there a
function solve equation for paramater x?!? Or something
like maple has?