PDE-why the error?

[wschrabi-disabl]

Dear friends,

here is a PDE MC11 sheet, and I got an error. (In MC14 it takes much longer and then an "unexplained error" occures)

Moreover I have attached also the paper from where I got the equs.

[wschrabi-disabl]

well, the reason was the step function as peak. Here the working MC14 worksheet, but the minerr takes sooooo long.

How can be this made faster?

The fitting function h(t) with the optimal parameters from the paper, looks good.

Advices are welcome.

Thanks

Walter

PS: I have added the second fitting function,b ut also this does not work.WHy?

[wschrabi-disabl]

ok, this is not solvable in MathCad - even in Maple the supplied OPtimization pachages could not find a solution. But for Maple there exists and add-on (Directsearch), which enables the solving of this fitting problem. I have attached the Maple Solution as PDF and the unsuccessful MCD sheet. Maybe someon outhere writes a MathCAD prg that can the same thing like that Maple Package.(I have attached the info about it)Well, finally also a MMA solution could be provided, but here we had to change the peak at the initial conditions. (See init(t)) I have attached the nb file, and the solution are a little bit others.

[jeanGiraud]

Where you will read this note:

>This data set is from another initialising function, not preserved .
The fit is iterative "Conjugate gradient".<

Just too bad but lost !.

What do you want to Minerr ? There is nothing to Minerr .

The PDE system applies what's needed to each direction.

If it does not exactly like demonstrated, that's because the

the system is insufficient wrt something, as simple as that.

The data set is no more reliable than than partially wrong .

I have considered and classified the project "done".

Cheers Walter, nice to see you again.

Thanks for this great project.

[jeanGiraud]

Walter,

If you can't find the final solution I have posted in the Mathcad collab

then ask for it in "Usage" . I understand it concerns PDE's but there is

no more categories in this community because there is no global

pane like Akiva. So, everything is "Mathcad", indistinctly of categories.

Why should we navigate so many categories to see something instead

of seeing all categories, i.e: all recent posting at once ?

jmG