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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 2.0.0.9 (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 : 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