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Re: A couple of beginner's questions

From: Archambault Fabien
Subject: Re: A couple of beginner's questions
Date: Mon, 25 Feb 2008 08:58:33 +0100
User-agent: Thunderbird (X11/20080213)

p.numminen a écrit :
Question 1:
How would I command Octave in order to find all the values of x that would
make the functions

f1(x) = 1.035568^x * 1000 - 1000 and
f2(x) = (1.025668^x * 1000 - 1000) * 0.72

equal with each other?
I am not sure but if you try to write f1(x)-f2(x) = 0 and solve it with the fsolve function it will work I think. You can see the help at this page :

Not really explicit but this function is for nonlinear solving.

Question 2:
How would I command Octave in order to solve the equation

1.035568^x * 1000 - 1.025668^x * 720 - 280 = 0

I think also see with fsolve because your equations are nonlinear. Or by hand using the "ln" function...

Fabien Archambault
Equipe de dynamique des assemblages membranaires
Unité Mixte de Recherches CNRS UHP 7565
Université Henri-Poincaré, Nancy I BP 239,
54506 Vandoeuvre-lès-Nancy, cedex France

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