Refactored for publishing.

Jean

Inst_Viscosity Water.sm (27 KiB) downloaded 76 time(s).

Hello Jean.

How do you get β:mat(-3.466,487.393,120.455)?

Best Regards

Carlos

Hello Jean.

How do you get β:mat(-3.466,487.393,120.455)?

Best Regards

Carlos
_____________________________

... from the "Genfit" minimize(XY,f,φ,β)
It works as well as the Mathcad "Minerr", though not so robust
as the Minerr Levenberg-Marquardt option.
No matter how much maths you will apply around exp(,) it will
not push the fit up to the critical limit. The critical range
is extracted from Thiele continued fraction. If I don't have
it ready done in Smath, give me some time to reconstruct.

Jean

Genfit Viscosity Water.sm (38 KiB) downloaded 43 time(s).

... here is Thiele "Water viscosity critical range".
Thiele does not come out of clicking the fingers.
The selection of support points is visual, automated
from "For loop list select" Smath module. Whereas the
continued fraction passes through the support points,
noisy data sets [sampled data are always noisy] take
lot of patience to make it work.

Cheers, Jean

Thiele Model Construct.sm (44 KiB) downloaded 48 time(s).