[Scilab-users] Convert x, y, z data into a z=f(x,y) function

[Dang, Christophe]

De la part de Michael J. McCann
Envoyé : lundi 1 juillet 2013 13:01

> Many years ago I worked on dynamic system models of fermentation.
> What I did was to create a differential equation set to account for 
> the identifiable "species"

I agree this would be a good way, which gives you a model that has 
sense.

If we make a simple z = f(x) (biomass = f(time)) plot (see attached 
document), we can see that 

1 - the curves do not follow a simple analytic function

2 - they are not completely parallel, especially for the last points

so, hard to fit with usual simple function.

Now, maybe a non-parametric analysis
-- i.e. not looking for a function but only for some characteristics of
your data --
is enough for you?

Maybe what you're looking for can be extracted from the initial slope,
the height of the first plateau, ..?

In fact, you try to answer a question, but we dont't know the 
question...

-- 
Christophe Dang Ngoc Chan
Mechanical calculation engineer

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