What to do when newton's method fail in MathCAD?

[AshehadAl]

Hi All,

Sometimes we use newton's method and Jacobi matrix to find root(s) to solve a system of coupled equations. At times the Jacobi matrix isn't invertible or the solutions that newton's method approximate are too large. As a result, MathCAD complains that either the Jacobi matrix is singular or the solutions are too large. So I am wondering if there are any other method in MathCAD to finding roots other than "root" and "newton's method"?

Ashehad

[jeanGiraud]

Third times you switch thread !

Use Richard demo, it is about unique for your project.

Use my fit and check if the Mathcad root does not solve.

Again, no work sheet no problem.

Secant, Newton, Rosenbrook

1. Newton = built-in

2. Secant = Mathcad work sheet

3. Rosenbrook = no recollection.

You are missing something very basic.

Try Given/Find

jmG