Dear All,
Just in case anyone finds it useful, I'm attaching a function to
simplify rationals which allows, unlike the native function simp, to set
a threshold below which a zero and a pole can be cancelled.
Regards,
Federico Miyara
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On 27/08/2020 17:55, Dang Ngoc Chan, Christophe wrote:
Hello,
De : Antoine Monmayrant
Envoyé : jeudi 27 août 2020 17:25
n=real(n);
Now it works.
Basic.
I thought about this and I know I tested some isreal(sellmeier(lambda)) stuff
during the development but I did not thought it would
Hello,
> De : Antoine Monmayrant
> Envoyé : jeudi 27 août 2020 17:25
>
> n=real(n);
>
> Now it works.
Basic.
I thought about this and I know I tested some isreal(sellmeier(lambda)) stuff
during the development but I did not thought it would happen during the
regression process with some
OK, forget my previous answer.
Use this:
function [n] = sellmeier(KL, lambda)
K1 = KL(1); K2 = KL(2); K3 = KL(3);
L1 = KL(4); L2 = KL(5); L3 = KL(6);
lambdacarre = lambda.*lambda;
foo1 = lambdacarre - L1;
foo2 = lambdacarre - L2;
foo3 = lambdacarre - L3;
foo =
Hello,
I can tell you what happened: for some values of lambda and some values
of K(4,5,6), your function is undefined and the leastsq goes kaboom!
It is never a good idea to fit a function that can become undefined for
some parameters/xvalues.
Try to redefine the function you fit to avoid
Hello all,
Let's talk about optics.
I have a glass, its refraction index n varies with the wavelength lamba.
I have a CSV file with the corresponding data (verre_HOQ.cvs attached), 52
points.
I want to model this with the Sellmeier model
https://en.wikipedia.org/wiki/Sellmeier_equation
and use
Hello Pierre,
Exactly like last time, its seems to be Windows10-specific as your
script does work as expected under Linux.
Antoine
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Hello,
We get an error when loading a « scg » file which has accented letters in
its file name
Here is a script to reproduce this error
//--
-
Rep="TMPDIR\"
chdir(Rep)
NameFile1=Rep + "Test.scg";
Hello Heinz,
> De : Heinz Nabielek
> Envoyé : lundi 24 août 2020 23:59
>
> I want all three straight lines to go simultaneously through one point at the
> negative x-axis.
> This is why I had to use a non-linear least-squares fit.
The calculation runs quite fats so it might not worth the effort
Hello Federico,
simp_mode is a function not a variable,
use :
simp_mode(%f);
Regards,
Antoine
Le 27/08/2020 à 09:50, Federico Miyara a écrit :
> Dear All,
>
> I need to have examples of rationals with very close poles and zeros, but the
> simp engine simplifies them. This is
Dear All,
I need to have examples of rationals with very close poles and zeros,
but the simp engine simplifies them. This is awkward, since the simp
documentation says there is no threshold, so other than identical poles
and zeros shouldn't be simplified. Actually this is the case with
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