AW: making a e-funtion of two covrdinates

*To*: mathgroup at smc.vnet.net*Subject*: [mg31641] AW: [mg31617] making a e-funtion of two covrdinates*From*: Matthias.Bode at oppenheim.de*Date*: Fri, 23 Nov 2001 05:46:05 -0500 (EST)*Sender*: owner-wri-mathgroup at wolfram.com

Hello Roderik, plug in your y and t values and try: \!\(InputForm\`\(y1 = 2\n y2 = 5\n t1 = 1\n t2 = 7\n Solve[{y1 == u\ \[ExponentialE]\^\(a\ t1\), y2 == u\ \[ExponentialE]\^\(a\ t2\)}, {u, a}]\)\) By the way, MATHEMATICA uses the widely accepted value of 2.71828..... for Euler's Number "e". Best regards, Matthias Bode Sal. Oppenheim jr. & Cie. KGaA Koenigsberger Strasse 29 D-60487 Frankfurt am Main GERMANY Tel.: +49(0)69 71 34 53 80 Mobile: +49(0)172 6 74 95 77 Fax: +49(0)69 71 34 95 380 E-mail: matthias.bode at oppenheim.de Internet: http://www.oppenheim.de Gesendet: Sonntag, 18. November 2001 12:29 An: mathgroup at smc.vnet.net Betreff: [mg31617] making a e-funtion of two covrdinates 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