Issue with Newton-Method

[AdamM]

Hi everyone,

I programmed a Newton-Method, but when I want to get the vector with results, there ist a failure message saying: "This Value Must be a Matrix of Scalar Elements". I unfortunatelly can´t see the mistake and already run out of ideas, but maybe some of you guys could know the solution.

Thanks!

[vlehner]

can you attach the file please?

[Fred_Kohlhepp]

Alan is right, your inequality needs reversed.  I also had to cheat the index value:

[AlanStevens]

I think your "while" condition should have "> eps" rather than "< eps".  However, this might not be the only problem, so upload your file as Volker suggested (you have to zip it first).

Alan

[AdamM]

Thank for that fast answers. So this is the original file, the inequality sign was of course wrong.

But unfortunatelly that doesn´t solve the problem.

[MJG]

Verify that you are properly using literal subscripts (.) and array subscripts ([).

I also agree with Alan & Volker.

[vlehner]

Maybe this could solve your problem.

I made the program by myself, so you should maybe convert it to your variabe names.

But principal it works.

Have fun...

[AdamM]

Thanks for typing it.

Your file works on my pc. I changed mine, so that it is more or less identical with yours, but it still ends up with the same error.

.

[vlehner]

very curious...

I loaded your file and had the same error.

Then i copied my routine into your sheet, changed xneu to xnew and it works.

Try the attached file please and let me know how does it works.

[Werner_E · Accepted solution]

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 but I still ends up with the same error.

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Right click on the vertical lines (absolute value) and change from "Square Matrix Determinant" to "Absolute Value".

[vlehner]

Impressive!

I changed it too and it works.

Simple changes with effective consequences.

[ValeryOchkov]

See please this method on the Mathcad server

http://twt.mpei.ac.ru/MCS/Worksheets/Math/Newton.xmcd

[ValeryOchkov]

For two equations

[vlehner]

[ValeryOchkov]

"Solution without animation is not solution!"

                                                      (Valery Ochkov)

[AdamM]

Thanks to all for all the useful answers!