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A
AdamM1-Visitor
1-Visitor
September 5, 2017
Solved

Issue with Newton-Method

  • September 5, 2017
  • 5 replies
  • 5442 views

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!

 

berechnung.jpg

Best answer by Werner_E
 but I still ends up with the same error.

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

Bild.png

5 replies

V
vlehner1-Visitor
1-Visitor
September 5, 2017

can you attach the file please?

 

F
Fred_Kohlhepp23-Emerald I
23-Emerald I
September 5, 2017

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

newton.JPG

A
AlanStevens19-Tanzanite
19-Tanzanite
September 5, 2017

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

A
AdamM1-VisitorAuthor
1-Visitor
September 5, 2017

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.

M
MJG1-Visitor
1-Visitor
September 5, 2017

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

I also agree with Alan & Volker.

V
vlehner1-Visitor
1-Visitor
September 5, 2017

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...

05-09-2017 17-29-24.jpg

A
AdamM1-VisitorAuthor
1-Visitor
September 5, 2017

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.

 

.NM_issue.png

 

V
vlehner1-Visitor
1-Visitor
September 5, 2017

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.

    V
    ValeryOchkov24-Ruby IV
    24-Ruby IV
    September 6, 2017

    See please this method on the Mathcad server

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

    Newton.png

      V
      ValeryOchkov24-Ruby IV
      24-Ruby IV
      September 6, 2017

      For two equations

      Newton-2-Equs.PNG

        V
        vlehner1-Visitor
        1-Visitor
        September 6, 2017

        06-09-2017 13-52-31.jpg

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