A couple of beginner's questions

[Archambault Fabien]

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 : http://octave.sourceforge.net/doc/f/fsolve.html

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

Tél : 03.83.68.43.96