Re: making a e-funtion of two coördinates
- To: mathgroup at smc.vnet.net
- Subject: [mg31646] Re: making a e-funtion of two coördinates
- From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
- Date: Fri, 23 Nov 2001 05:46:12 -0500 (EST)
- Organization: Universitaet Leipzig
- References: <9t86cv$r6l$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Hi, y==U*Exp[a*t] is for real values Log[y]==Log[U]+a*t an linear function of Log[y]. You can determine Log[U] and a for Fit[] Regards Jens TheSquaredBun wrote: > > I have got two coordinates out of graph. The line through the > coordinates could be described as: > > y = U * e^(a * t) > > (e is Exponetial e (approx. 2.37)) > > t is the x-value, I have give two points (t1,y1) and (t2,y2) > > I have tried several things (Solve and Fit for example), but I can't > get the function. > Does anyone know what should be the input to let Mathematica solve the > a and U in the formula. > > Much thanks in advance, > > Roderik > r.f.emmerink at st.hanze.nl