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