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From: | Geraint Paul Bevan |
Subject: | Re: ODE system solving |
Date: | Tue, 11 Jan 2005 15:25:42 +0000 |
User-agent: | Mozilla Thunderbird 0.7.1 (X11/20040715) |
address@hidden wrote:
i've tryed with odessa: T0=520; Ta=25+273; w0=3.4; y0=[w0 p T0]; z=linspace(0,L,L)'; y=odessa("SysO",y0,p,100,z); plot(z/L,(y(:,3)-Ta)/(T0-Ta))it doesn't work! "error: "P" undefined near line...."i think i can set a parameter "p" for Odessa, ins't it? it's something wrong?
P should be a vector of parameters. odessa will use these to find the sensitivity of the states to changes in these parameters. Unless you want to use these sensitivities, there is probably not much reason to use odessa. Octave is a matrix algebra tool, not a computer algebra system. Unless you are using a symbolic toolbox, values should be assigned to all variables before you use them. The error message occurs because you have passed p to the function without first giving it a value. -- Geraint Bevan http://www.mech.gla.ac.uk/~gbevan ------------------------------------------------------------- Octave is freely available under the terms of the GNU GPL. Octave's home on the web: http://www.octave.org How to fund new projects: http://www.octave.org/funding.html Subscription information: http://www.octave.org/archive.html -------------------------------------------------------------
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